Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
tran tuan » tran xuan, tran quang, tran thanh
ho chieu » theo chieu, hoc thieu, mot chieu
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tung va » trung va, tuong va, vung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) sach - thanh ((tung va) or (dung va)) dung cong tac tran tuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - thanh ((tung va) OR (dung va)) dung cong tac tran tuan.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - thanh ((tung va) or (dung va)) dung cong tac tran tuan*.