Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua nhung » va nhung
chinh can » chinh ca, chinh ban, chinh cau
doc hieu » toc thieu, hoc thieu, hoc hien
tinh cua » trinh cua, sinh cua, tinh chat
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
can cau » van cau, ban cau, ca cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - hanh tinh cua nhung ((cong tan) or (cong san)) ((can cau) or (chinh can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh tinh cua nhung ((cong tan) OR (cong san)) ((can cau) OR (chinh can)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh tinh cua nhung ((cong tan) or (cong san)) ((can cau) or (chinh can))*.