Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
lanh manh » lanh tranh, lan anh, anh anh
cua nhung » va nhung
doi hieu » doi chieu, doc hieu, doi hien
van manh » van minh, van anh, van hanh
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: doi hieu lang - ((lanh manh) OR (van manh)) cua nhung cong tan ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ((lanh manh) OR (van manh)) cua nhung cong tan ((than cau) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - ((lanh manh) OR (van manh)) cua nhung cong tan ((than cau) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ((lanh manh) OR (van manh)) cua nhung cong tan ((than cau) or (than cap))*.