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