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- Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach lich) or (mach tich)) su - ((hoa giao) or (((toan ban) or (van ban))))~.
- If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach lich) OR (mach tich)) su - ((hoa giao) OR (((toan ban) OR (van ban)))).
- Adding a wildcard symbol may retrieve word variants: tu ((sach lich) or (mach tich)) su - ((hoa giao) or (((toan ban) or (van ban))))*.