Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
trong dang » truong dang, trong dong, trong dung
hieu lang » chieu sang, hieu quang, nhieu tang
trong dan » trong san, trong tan, trong ban
cua dung » cua dang, cua dong, qua dung
than ban » thanh ban, toan ban, than man
ho hieu » ho chieu, hoi hieu, nho hieu

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

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