In order to increase vocabulary and gain new expressions it is useful to study collocations. A collocation is a group of words which combine to have a special meaning.
For example, if we consider the verb "do", we can combine it with many other nouns to explain activities. For example, do the dishes, do my make-up, do the dinner, and so on.
When you learn a new word try to find as many collocations as you can.
Good luck with your study!