Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
yen tinh » tuyen tinh
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
cot » cost

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: cot ((yen tinh) OR (diep tinh)) - hanh trinh cua nhung cong ((dan toan) OR (van toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cot ((yen tinh) or (diep tinh)) - hanh trinh cua nhung cong ((dan toan) OR (van toan)) tap~".
• Adding a wildcard symbol may retrieve word variants: cot ((yen tinh) or (diep tinh)) - hanh trinh cua nhung cong ((dan toan) OR (van toan)) tap*.