Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
dung cong » dung trong
cong tran » cong tan, cong tuan, cong toan
hoc vien » hoc hien, hoc viet, hoc tieng
vien anh » vien canh, viet anh, dien anh
trinh va » trinh van, trinh vat, trinh ve
van chat » cao chat
va dung » van dung, va duong, vat dung
van cau » van dau, van hau, toan cau

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

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