While the Search capabilities of the Adobe Community Help Client (CHC) are indeed very powerful, I also find the Find feature of the CHC very handy. You can search for a word or a phrase on a page displayed in the CHC in a keystroke.
Just press Ctrl+F and enter the word or phrase that you want to find. The CHC highlights the word or phrase that you are searching for, so you can see all instances of your search at once. You can also match case, and scroll backwards or forwards through the instances of the word on that page.
So, while you would use the many search refinements in the CHC, don’t forget the very handy Ctrl+F!