Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh vat » trinh van, trinh luat, sinh vat
vat nhung » va nhung, vap nhung, vai nhung
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
ho chau » ho chu, o chau, khoa chau
ha chau » hat chau, a chau, lai chau

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 chau) OR (ha chau)) tinh - hanh trinh vat nhung ((cong tan) OR (cong tac)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chau) OR (ha chau)) tinh - hanh trinh vat nhung ((cong tan) or (cong tac)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chau) OR (ha chau)) tinh - hanh trinh vat nhung ((cong tan) or (cong tac)) toan cau*.