Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tac » cong ty
quan ban » quang ban, qua ban, luan ban
quan van » luan van, quan va, quan luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh trung cua nhung ((cong san) or (cong tac)) ((quan ban) OR (quan van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trung cua nhung ((cong san) OR (cong tac)) ((quan ban) OR (quan van)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh trung cua nhung ((cong san) or (cong tac)) ((quan ban) OR (quan van))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trung cua nhung ((cong san) or (cong tac)) ((quan ban) OR (quan van))*.