Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
nhung cau » chung cu, nhung bai, nhu cau
hoc hieu » hoc thieu, hoc hien, doc hieu
cong cua » dong cua, huong cua, thong cua
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
cong cu » chung cu

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 ((cong cua) or (cong cu)) nong ((cong ban) OR (cong san)) nhung cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh ((cong cua) OR (cong cu)) nong ((cong ban) OR (cong san)) nhung cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - thanh ((cong cua) or (cong cu)) nong ((cong ban) OR (cong san)) nhung cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh ((cong cua) or (cong cu)) nong ((cong ban) OR (cong san)) nhung cau*.