Synonyms - Always try to think of other terms that might be used for the topic you are searching.
Broad to narrow - Better to start with a broad search and narrow it down once you make sure the broadest part of your topic finds results. You may need more synonyms if you are not finding any results.
Truncation - * allows you to look up plural, e.g. misconception* and also words with or without hyphens or spaces
"" - quotation marks keeps two words together as a phrase, e.g. "antibiotic resistance".
Each database has it's own quirks and indexes different articles so try and search in at least one from biology and one from education.
You may find lots of articles relating to students so some aspect of your target audience for the misconception may need to be added to your search.
email me if you are having trouble searching and I can help you tweak your search strategy.