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- Performing a fuzzy search may retrieve terms with similar spellings: trinh dung ((((chan doan) or (chuan doan))) or (quan luan)) ((hieu soat) or (hieu qua))~.
- If you are trying to use Boolean operators, they must be ALL CAPS: trinh dung ((((chan doan) OR (chuan doan))) OR (quan luan)) ((hieu soat) OR (hieu qua)).
- Adding a wildcard symbol may retrieve word variants: trinh dung ((((chan doan) or (chuan doan))) or (quan luan)) ((hieu soat) or (hieu qua))*.