Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
nhung cong » dung cong, thong cong, nhung don
hang cong » dang cong, hang nong, bang cong
manh toan » thanh toan, anh tuan, tinh toan
tranh va » tranh van, trang va, trinh va
dan toan » van toan, dan than, xuan toan
hoan » hoang, hoa, soan

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: hoan thien thanh - canh tranh va ((nhung cong) OR (hang cong)) ((dan toan) OR (manh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoan thien thanh - canh tranh va ((nhung cong) or (hang cong)) ((dan toan) OR (manh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoan thien thanh - canh tranh va ((nhung cong) or (hang cong)) ((dan toan) OR (manh toan)) cau*.