Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hinh » hanh chinh, hanh tinh, hanh dinh
cua nhung » va nhung
chinh can » chinh ca, chinh ban, chinh cau
doc hieu » toc thieu, hoc thieu, hoc hien
hinh cua » chinh cua, sinh cua, tinh cua
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
chan cau » phan cau, can cau, chinh 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 hinh cua nhung ((cong tan) or (cong san)) ((chan cau) or (chinh can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - hanh hinh cua nhung ((cong tan) OR (cong san)) ((chan cau) OR (chinh can)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh hinh cua nhung ((cong tan) or (cong san)) ((chan cau) or (chinh can))*.