I've tried reading through the first paragraphs and here are my suggestions (but I'm not a teacher!)
A lot of Algerian people complain all day long; about work, people's behaviour, the weather and the list could be much longer; I guess that everyone's question is "How can I be happy? How can I get happiness?" or "How can I become happier?".
We do indirectly believe in happiness but don’t know the way to it. We are always looking for it, searching for a method or technique that can render us happy even when happiness is already in our hands and we don’t know or haven't realised yet!
To reach happiness, we have to look into its meaning. Certainly it is for almost all people a state that is difficult to reach.
For some it is limited to money, cars, big houses, or other material possessions whose list will never finish because simply they are so greedy. In fact, even if they have all the things and conditions that can make them happy, they will still ask for more.
I honestly don’t know why we can't feel content with what we have. This is therefore the first point that we should bear in mind if we want to be happy: we must be satisfied with what we have. As Aristotle said, "to live happily is an inward power of the soul”. Nevertheless in Algeria, such people (you should better explain what "such" refer to) can be counted on the tips of our fingers.