Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh tung
quan duong » tuan duong, quan dong, qua duong
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » chieu sang, hieu quang, nhieu tang
quan dung » quang dung, qua dung, quan dong
cong manh » cong danh, duong manh, hoang manh
hoc hieu » hoc thieu, hoc hien, doc hieu
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - thanh truong ((quan dung) or (quan duong)) ((cong manh) OR (cong thanh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh truong ((quan dung) OR (quan duong)) ((cong manh) OR (cong thanh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - thanh truong ((quan dung) or (quan duong)) ((cong manh) OR (cong thanh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh truong ((quan dung) or (quan duong)) ((cong manh) OR (cong thanh)) toan ban*.