Here are various Google tips to assist in your research:
To put more emphasis on one of the words in your search results, repeat the word in the search.
Two periods between two numbers is like typing all the numbers into the search box. This would be very helpful when searching for entries in a range of years.
Google will provide a definition by using the search "define:word". For example, "define: nanotechnology" will result in various definitions. Of course, the results must be analyzed by the user to determine accuracy.
CALCULATOR & CONVERTER
The Google search box is a calculator--try typing 2+2. Even better, it's a converter--try 10kg in lbs. It does monetary conversions, too (with a disclaimer).
A tilde (~) in front of a word in your search tells Google that you also want to search for synonyms. For example, "tire" brings up 104 million entries, but "~tire" increases the results to 414 million. The results now include words such as "tyre" (the British spelling). Becareful and update your search as needed, because "rubber" was also included which might have nothing to do with your information need.