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
nho hieu » nha hieu, nho sieu, nhu hieu
tang cua » mang cua, hang cua, tang luan
manh cua » ban cua
cong tai » cong thai, cong tac, dong tai
tai phan » tai thanh, tai phong, tai ngan

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: nho hieu lang - hanh ((tang cua) OR (((manh cua) OR (doanh cua)))) nhung cong tai phan tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho hieu lang - hanh ((tang cua) or (((manh cua) OR (doanh cua)))) nhung cong tai phan tu~".
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh ((tang cua) or (((manh cua) OR (doanh cua)))) nhung cong tai phan tu*.