Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
nguong dan » huong dan
hoc chieu » hoc thieu, ho chieu, hoc hien
trinh van » trinh han, trinh quan, trinh toan
van hanh » van thanh, ban hanh, van anh
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than tap » toan tap, han tap, phan 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 chieu tinh - hanh trinh van hanh ((nguong dan) or (((cong dan) OR (cong tan)))) than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - hanh trinh van hanh ((nguong dan) OR (((cong dan) OR (cong tan)))) than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu tinh - hanh trinh van hanh ((nguong dan) or (((cong dan) OR (cong tan)))) than tap".
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - hanh trinh van hanh ((nguong dan) or (((cong dan) OR (cong tan)))) than tap*.