Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cau » chung cu, nhung bai, nhu cau
hoc hieu » hoc thieu, hoc hien, doc hieu
cong cua » cong cu, dong cua, huong cua
cua nong » cua cong, cuu nong, cua dong
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh

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 quang - thanh cong cua nong ((cong ban) or (cong tan)) nhung cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - thanh cong cua nong ((cong ban) OR (cong tan)) nhung cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - thanh cong cua nong ((cong ban) or (cong tan)) nhung cau*.