Perhaps you should try some spelling variations:
quan nhung » cua nhung, luan chung, quang hung
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
qua nhung » cua nhung, qua chung, chua nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tac » cong ty
toan cao » toan ban, toan tap

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