Use correct spelling of the words. Attempt your search using different word orders. Try using different words that mean the same thing.
Some search engines are sensitive to capital versus lower case letters.
When you find a good web site investigate links from that site. Here is a list of web sites that may help you start your search. Try a search engine. Google - Search in languages other than English, too. Looking for a specific book on a child health or wellness topic, search our Library .