Perhaps you should try some spelling variations:
khoai chau » khoa chau, khoa phau, hai chau
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
luan hang » luan nang, luan han, luan hung
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
tran cau » tran chau, toan cau, ran cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((khoai chau) or (lai chau)) tinh - canh trinh luan hang ((cong tan) or (cong tac)) tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((khoai chau) OR (lai chau)) tinh - canh trinh luan hang ((cong tan) OR (cong tac)) tran cau.
• Adding a wildcard symbol may retrieve word variants: ((khoai chau) or (lai chau)) tinh - canh trinh luan hang ((cong tan) or (cong tac)) tran cau*.