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 » tang luan, thong cua, quang cua
mang cua » manh cua, dung cua, ban cua
hang cua » hang ca, huong cua, thong cua
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan dau » phan tu, hang dau
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 (mang cua))) OR (hang cua)) nhung cong tac phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((((tang cua) OR (mang cua))) or (hang cua)) nhung cong tac phan dau~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((((tang cua) OR (mang cua))) or (hang cua)) nhung cong tac phan dau*.