Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
manh trung » manh tung, thanh trung, manh hung
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc hien)) sach - manh trung cua nhung cong tan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) sach - manh trung cua nhung cong tan than cap.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) sach - manh trung cua nhung cong tan than cap*.