Determine keywords you can use to conduct your search. Don't type in a sentence.
For example: search chemicals oil based paint, not what is the chemistry of oil based paint.
If you don't get results with specific keywards, try using different words.
For example: If chemistry hair relaxers doesn't yield results, try chemicals hair relaxers.
Whe using Google, if you have two words that should appear together in your search, put them in quotation marks.
For example: search "nail polish" not nail polish.
Check the authority of your source. The domain name can help with this. Is the site from an educational organization like a college or university - .edu? Is it from a government agency - .gov?
Are you sure the site is not biased?