Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
manh dung » manh hung, manh tung, anh dung
cua nhung » va nhung
dung cua » dung luan, dung cho
cong tan » cong tac, cong san, cong thanh
han tap » toan tap, nhan tai, nhan tao
han tai » hang tai, nhan tai, van tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chinh sach) or (hieu lang)) - manh dung cua nhung cong tan ((han tap) or (han tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu lang)) - manh dung cua nhung cong tan ((han tap) OR (han tai)).
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - manh dung cua nhung cong tan ((han tap) or (han tai))*.