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Keep it simple! Use short, single terms unless your searches are returning too many results.
Use quotes to search for an entire phrase -- e.g., "protein folding".
Except for boolean operators, searches are not case-sensitive, so "Geneva" and "geneva" are equivalent.
If you are unsure of the correct spelling, put ~ at the end of your search term -- e.g., cabage~ finds cabbage, steven~ finds Stephen and Stefan (as well as other similar names).

When you enter more than one term, search will return results containing all of them unless you add the Boolean "OR" -- e.g., chicken OR egg.
"NOT" can help limit searches -- e.g., climate NOT change.
Phrase searches may be combined with Boolean operators -- e.g. "climate change" OR "global warming".
Close word variations will also be found -- e.g., sequence matches sequences and sequencing.
Use the wildcard * character to match an even wider variation -- e.g., nano* will match both nanotechnology and nanofabrication.
Search uses shortened versions of words -- e.g., a search for cogniti* finds nothing, while cognit* finds both cognitive and cognition.