Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
bien tinh » bi tinh, yen tinh, diep tinh
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
cong tan » cong thanh, cong ty, cong ha
cong tac » cong ty
toan cao » toan ban, toan tap
ho bien » pho bien, hoa bien, so bien

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 bien tinh - hanh trinh cua nhung ((((cong tan) OR (cong san))) OR (cong tac)) toan cao~.
• Adding a wildcard symbol may retrieve word variants: ho bien tinh - hanh trinh cua nhung ((((cong tan) or (cong san))) or (cong tac)) toan cao*.