Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
quan nhung » cua nhung, luan chung, quang hung
hieu lang » chieu sang, hieu quang, nhieu tang
qua nhung » cua nhung, qua chung, chua nhung
hai hieu » hai chieu, hoi hieu, phan hieu
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

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