幸福 in Chinese / Japanese...

幸福 is a general state of happiness that can also be translated as truly blessed, welfare, well-being, or fortunate.

幸福永恆 is a short way to say eternal happiness in Chinese.

Breaking down the parts:
幸福 means happiness, happy, blessed, blessedness, joy, and/or well-being.
永恆 means eternal, everlasting, and/or forever.

Another way to write this is 永恆的幸福. It reverses the word order and adds a possessive article. I prefer the shorter version, which is slightly more natural in Chinese.

幸福與愛 is “happiness and love” in Chinese.

There is a suggestion of “good fortune” in the version of happiness used here.

追尋幸福 is the best way to translate the English phrase “pursuit of happiness” into Chinese.

The first two characters mean “to pursue,” “to track down,” or “to search for.”

The last two mean happiness, happy, or being blessed.

幸福學校 means “School of Happiness” or “Happiness School” in Chinese.

幸福 means happiness, happy, blessed, blessedness, joy, and/or well-being.

學校 means school or college.

永遠の幸福 means “eternal happiness” in Japanese.

永遠 means eternal, eternity, perpetuity, forever, immortality, and permanence.

の is a possessive article which sort of makes this selection mean “happiness, of the eternal kind.”

幸福 means happiness, though this word can be translated as truly blessed, joy, happy, welfare, well-being, or fortunate.

幸福の学校 means “School of Happiness” in Japanese.

This is not a common phrase in Japanese, but it will be understood.

和平博愛幸福 is a word-list that means “peace, love, happiness,” in Chinese.

Word lists like this are not commonly-seen in China. Phrases with subject, verb, and object, or just single words are more natural for calligraphy artwork.

幸福を求めて is “Pursuit of Happiness” or “In Search of Happiness” in Japanese.

Here's how the characters break down:
幸福 (koufuku) happiness; blessedness; joy; well-being.
を (o) particle
求め (motome) to want; to seek; to pursue; to request
て (te) particle

Note: Because this selection contains some special Japanese Hiragana characters, it should be written by a Japanese calligrapher.

幸福の七カ条 is the title for the 7 rules of happiness in Japanese.

The rules themselves take up a lot of space:

1. 成功や栄誉や勝ち負けを目的に、ことを行ってはいけない。
2. しないではいられないことをし続けなさい。
3. 他人との比較ではない、あくまで自分の楽しさを追及すべし。
4. 好きの力を信じる。
5. 才能と収入は別、努力は人を裏切ると心得よ。
6. 怠け者になりなさい。
7. 目に見えない世界を信じる。

...so this title is probably all you need.

Note: Because this selection contains some special Japanese Katakana characters, it should be written by a Japanese calligrapher.

平和, 愛, 幸福 means “peace, love, happiness” in Japanese.

This is a word list, which is not the most natural kind of composition in Japanese (usually there is a subject, object, and verb - or a single word).

幸福金婚 means “Happy Golden Anniversary” and is a great gift for a couple who is celebrating 50 years together.

The first two characters mean happy, blessed, or happiness.

The last two characters mean “couple's golden anniversary.” It means “golden wedding” or “golden marriage,” but this is only used for the 50-year-mark of a marriage (the same way we use gold to represent 50 years in the west).

幸福金婚 is a nice title to use with an inscription. You could request something like, “Happy 50th Anniversary, Mr. and Mrs. Smith,” to be written down the side of this title in smaller Chinese characters.

Please note: This can be pronounced and understood in Japanese but not as commonly used in Japan. Japanese people who read this will understand it but might tend to feel it’s of Chinese origin.

幸福成功的一生 means “A life of happiness and prosperity” or “A life of happiness and success.”

It's a very positive and inspirational wall scroll selection.

幸福と繁栄の人生 is a Japanese proverb that means “A life of happiness and prosperity” or “A life of happiness and success.”

Note: Because this selection contains some special Japanese Hiragana characters, it should be written by a Japanese calligrapher.