Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
quan dung » quang dung, quan duong, qua dung
trong dan » trong dang, trong tan, trong ban
trong san » trong cac, dong san, trong ca
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
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 quan dung ((trong dan) or (((trong san) OR (cong san)))) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trinh quan dung ((trong dan) OR (((trong san) OR (cong san)))) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh trinh quan dung ((trong dan) or (((trong san) OR (cong san)))) toan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trinh quan dung ((trong dan) or (((trong san) OR (cong san)))) toan cau*.