Determine keywords you can use to conduct your search. Don't type in a sentence.
For example: search renewable resources, not what are some renewable resources.
If you don't get results with specific keywards, try using different words.
For example: If renewable resources doesn't yield results, try renewable energy.
Whe using Google, if you have two words that should appear together in your search, put them in quotation marks.
For example: search "solar energy" not solar energy.
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?