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- Performing a fuzzy search may retrieve terms with similar spellings: ((khoa hoc) or (hoa hoc)) & ((phaptm or khac) or khi) (phan or phammtn )~.
- If you are trying to use Boolean operators, they must be ALL CAPS: ((khoa hoc) OR (hoa hoc)) & ((phaptm OR khac) OR khi) (phan OR phammtn ).
- Adding a wildcard symbol may retrieve word variants: ((khoa hoc) or (hoa hoc)) & ((phaptm or khac) or khi) (phan or phammtn )*.