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