Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
hoc chieu » hoc thieu, ho chieu, hoc hien
tran manh » tran minh, tran thanh, tran van
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than man » than ma, thanh san, than phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu tinh - hanh trinh va nhung ((cong dan) or (cong san)) ((than man) OR (tran manh))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - hanh trinh va nhung ((cong dan) OR (cong san)) ((than man) OR (tran manh)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu tinh - hanh trinh va nhung ((cong dan) or (cong san)) ((than man) OR (tran manh))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - hanh trinh va nhung ((cong dan) or (cong san)) ((than man) OR (tran manh))*.