Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
cua phuong » cuu phuong, cuc phuong, luan phuong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
ca thuong » cao thuong, cua thuong, va thuong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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: doc hieu tinh - hanh trinh ((cua phuong) OR (ca thuong)) ((cong dan) OR (cong san)) toan cau~.
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - hanh trinh ((cua phuong) or (ca thuong)) ((cong dan) or (cong san)) toan cau*.