Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, chau tinh, kieu tinh
hanh trung » thanh trung, hanh trang, manh trung
lieu tinh » trieu tinh, diep tinh, bien tinh
trung va » truong va, trang va, trung ha
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cao » toan cao, thai cao, than cap
va dung » van dung, va duong, vat dung

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) OR (lieu tinh)) - hanh trung va dung ((cong dan) or (cong tan)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (lieu tinh)) - hanh trung va dung ((cong dan) OR (cong tan)) than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) OR (lieu tinh)) - hanh trung va dung ((cong dan) or (cong tan)) than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) OR (lieu tinh)) - hanh trung va dung ((cong dan) or (cong tan)) than cao*.