To get better results, do a "Title begins with…" search instead of a "Keyword" search.
Use the "Subject" links in a record to narrow your search.
If you are not finding a book on your chemical in the library - use some information from the definition of your chemical to find a book - ie. - is it a reagent? A salt? An explosive? Some other thing? Then look up a book on that thing and go find it in the library, then look in the index for your chemical.