Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac
ban cua » ban quan

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