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- Performing a fuzzy search may retrieve terms with similar spellings: "((khoa hoc) or (hoa hoc)) & (nham or khac) (phan" or (pham" or (phatm" or phamtm")))~.
- If you are trying to use Boolean operators, they must be ALL CAPS: "((khoa hoc) OR (hoa hoc)) & (nham OR khac) (phan" or (pham" OR (phatm" or phamtm"))).
- Removing quotes may allow a broader search: ((khoa hoc) or (hoa hoc)) & (nham or khac) (phan or (pham or (phatm or phamtm ))).
- Adding a wildcard symbol may retrieve word variants: "((khoa hoc) or (hoa hoc)) & (nham or khac) (phan" or (pham" or (phatm" or phamtm")))*.