Using Boolean operators you can take the core concepts from your keyword list and string them together.
A typical search can look like:
(dance therapy) AND (adolescent)
This will bring me back all articles that contain all three terms. But if I want to expand my pool (and get other relevant articles), I can add additional search terms or keywords so my search string looks like:
(dance therapy) AND (adolescent OR children) AND (stress OR anxiety)
Using AND/OR together will both broaden the results you get (OR) but make them revelant to your topic (AND).