Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
quan bang » quan lang, tuan bang, quan hoang
bang cong » dang cong, bang song, hang cong
nho hieu » nha hieu, nho sieu, nhu hieu
cong san » cong tac
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.

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