Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
lanh manh » lanh tranh, lan anh, van manh
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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 - lanh manh ((cua thong) or (cua khong)) cong tan ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - lanh manh ((cua thong) OR (cua khong)) cong tan ((than cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - lanh manh ((cua thong) or (cua khong)) cong tan ((than cau) or (than cap))*.