Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
thieu qua » thieu cua, thieu quang, thien quan
trang cac » trong cac, trang cham, trong cach
tranh cac » trinh cac, thanh cac, tranh cai
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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 qua) OR (thieu qua)) - hanh ((trang cac) OR (tranh cac)) phuong cong tan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu qua) or (thieu qua)) - hanh ((trang cac) OR (tranh cac)) phuong cong tan toan ban~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu qua) or (thieu qua)) - hanh ((trang cac) OR (tranh cac)) phuong cong tan toan ban*.