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- Performing a fuzzy search may retrieve terms with similar spellings: "((khoa hoc) or (hoa hoc)) & kham (phan" or ((phapm" or ((pdan" or dang") or tdang")) or phat"))~.
- If you are trying to use Boolean operators, they must be ALL CAPS: "((khoa hoc) OR (hoa hoc)) & kham (phan" or ((phapm" OR ((pdan" or dang") OR tdang")) or phat"))*.
- Removing quotes may allow a broader search: ((khoa hoc) or (hoa hoc)) & kham (phan or ((phapm or ((pdan or dang ) or tdang )) or phat ))*.