Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
tang cua » mang cua, tang luan, thong cua
hang cua » mang cua, hang ca, huong cua
cong tac » cong ty
phat dau » phan dau, phap dau, thuat dau
pham dau » phan dau, pham dac, pham dat
ho hieu » ho chieu, hoi hieu, nho hieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((tang cua) OR (hang cua)) nhung cong tac ((phat dau) OR (pham dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((tang cua) or (hang cua)) nhung cong tac ((phat dau) OR (pham dau))~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((tang cua) or (hang cua)) nhung cong tac ((phat dau) OR (pham dau))*.