Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong dan » cong san, cong tan, cong dong
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: hoc hieu lang - hanh trinh ((cua dung) OR (qua dung)) ((cong dan) or (huong dan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trinh ((cua dung) OR (qua dung)) ((cong dan) OR (huong dan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh trinh ((cua dung) OR (qua dung)) ((cong dan) or (huong dan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trinh ((cua dung) OR (qua dung)) ((cong dan) or (huong dan)) toan cau*.