Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc kien » hoc hien, hoc vien, hoa kien
kien mac » dien mao, tien mai, kien ha
cua hang » cua dang, cua nhung, cua ban
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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: hoc kien mac - hanh trinh ((cua hang) OR (cua cong)) ((cong dan) OR (cong tan)) toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc kien mac - hanh trinh ((cua hang) OR (cua cong)) ((cong dan) or (cong tan)) toan tap~".
• Adding a wildcard symbol may retrieve word variants: hoc kien mac - hanh trinh ((cua hang) OR (cua cong)) ((cong dan) or (cong tan)) toan tap*.