Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
doanh cua » doanh luan
doi hieu » doi chieu, doc hieu, doi hien
manh cua » ban cua
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tap
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 cua) or (doanh cua)) nhung cong tan ((toan cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - lanh ((manh cua) OR (doanh cua)) nhung cong tan ((toan cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - lanh ((manh cua) or (doanh cua)) nhung cong tan ((toan cau) or (than cap))*.