Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trinh » canh tranh, hanh chinh
trinh van » trinh han, trinh quan, trinh toan
van nhung » van nhuong, va nhung, van hung
thi hieu » thi chieu, thi hien, thi dieu
cong san » cong tac
ran cau » ban cau, can cau, tran chau
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (thi hieu)) xanh - hanh trinh van nhung cong san ((ran cau) or (van cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (thi hieu)) xanh - hanh trinh van nhung cong san ((ran cau) OR (van cau)).
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (thi hieu)) xanh - hanh trinh van nhung cong san ((ran cau) or (van cau))*.