Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
mang cua » dung cua, ban cua, dong cua
cong cua » cong cu, dong cua, huong cua
manh cua » doanh cua, ban cua
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan cau » phan dau, phan cac, phan tu
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 quang - hanh ((((mang cua) OR (cong cua))) OR (manh cua)) nhung cong tac phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quang - hanh ((((mang cua) OR (cong cua))) or (manh cua)) nhung cong tac phan cau~".
• Adding a wildcard symbol may retrieve word variants: ho hieu quang - hanh ((((mang cua) OR (cong cua))) or (manh cua)) nhung cong tac phan cau*.