Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
ho chiet » ho chieu, ho thiet, hoc thiet
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - ((hanh trinh) or (thanh tung)) va nhung cong tac than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - ((hanh trinh) OR (thanh tung)) va nhung cong tac than cao.
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - ((hanh trinh) or (thanh tung)) va nhung cong tac than cao*.