Keyword searches look for resources using any words that describe your topic.
Make a list of words that refer to your topic.
Put one word in the search box and search and see what you get. (Example: Brain Based Learning)
To search for books and videos using keywords:
Don't put an entire sentence in the search box!
Start off slowly.
Put one word and then search.
Then add another.
This way if all of a sudden you don't get any hits, you know you should take the last word added and change it to something else.