Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
dung cong » dung trong
dien dan » hien dai, gian dan, dien va
vien dai » hien dai
trinh va » trinh van, trinh vat, trinh ve
cong tan » cong tac, cong san, cong thanh
va dung » van dung, va duong, vat dung
van cau » van dau, van chat, toan cau
van hau » van ha, van hai, van dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((dien dan) or (vien dai)) - hanh trinh va dung cong tan ((van cau) or (van hau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dien dan) OR (vien dai)) - hanh trinh va dung cong tan ((van cau) OR (van hau)).
• Adding a wildcard symbol may retrieve word variants: hoc ((dien dan) or (vien dai)) - hanh trinh va dung cong tan ((van cau) or (van hau))*.