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