Translation from your Chinese,

幸福在哪里？Where is happiness?

有人说金钱让人幸福。Some say money gives happiness.

有人说 爱情让人幸福。Some say love give happiness.

什么才是幸福? So what is happiness?

如果我们既没有钱也没有爱情，If we don't have money and no love

那我们的幸福在哪里找 Whence does happiness come from?

也许幸福是来自于我们的内心，Perhaps happiness comes from within our hearts.

一种平静的感觉。 A kind of quiet feeling.

Now it makes so much more sense.  One way of learning and improving your English is to translate.  Write in Chinese and then in English, side by side.  Never mind if it is not good or perhaps even bad.  However, we will help you to correct.  By learning from correction of others, you will improve.  If you don't understand why it is translated or constructed this way.  Ask, ask and ask.  Never mind if you ask a thousand times.  This is the way to learn.  As students, you need to be thick skin!  I am always here to help.  That is if you only ask.  You don't ask, I assume you know.  If I don' t like to help, I won't be spending my time here on ITALKI.

happinese

Where is happinese? Someone said it is from money, someone said it is from love, what if we dont both of them, maybe it is from our heart, peaceful feelings

happinese Happiness

Where is happinese happiness? Someone said it is comes from money, someone others said it is comes from love., what if we dont both of them, maybe it is from our heart, peaceful feelings Maybe it's a bit from both, money makes our heart feel good and then happiness can come out of the heart. 

I don't understand your last line.  So I am guessing.  Write in Chinese if you want an accurate correction.