Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh quan
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, cong dong
toan cao » toan ban
toan tap » toan ban

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 ((cong dan) or (huong dan)) ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh trinh cua dung ((cong dan) OR (huong dan)) ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh trinh cua dung ((cong dan) or (huong dan)) ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh trinh cua dung ((cong dan) or (huong dan)) ((toan cao) OR (toan tap))*.