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- If you are trying to use Boolean operators, they must be ALL CAPS: (( yu ting chen xu she li cong shu ) OR ( tu ((ming chen) OR (heng chen)) xi she li yong bao )).
- The words AND, OR and NOT may confuse the search; try adding quotes: "(( yu ting chen xu she li cong shu ) or ( tu ((ming chen) OR (heng chen)) xi she li yong bao ))".
- Adding a wildcard symbol may retrieve word variants: (( yu ting chen xu she li cong shu ) or ( tu ((ming chen) OR (heng chen)) xi she li yong bao ))*.