Use the most important (or "key") words describing your topic, not full sentences and not your research question.
Once you've determined your KEYWORDS, be sure to also list synonyms for those words in case you need to adjust your search strategy.
Keywords: global warming and animals and arctic (Synonyms: climate change and wildlife and polar)
Keywords: NFL and concussion and protocols (Synonyms: professional football and brain injury and rules)
Keywords: drones and military and human rights (Synonyms: remote-controlled weapons and government and civil rights)
Look for synonyms at www.synonym.com
Your search, using these connectors, LOOKS like this:
Use quotation marks around a two word phrase to find those keywords in the order you typed them in and next to each other instead of separately.
will find sources that mention human rights, whereas
human and rights
will find you sources that mention both words, regardless of whether they are next to each other in the text.
Quotation marks turn a phrase into a single word, for searching purposes.