Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh tang » hanh trang, anh tang, hanh mang
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban
tang va » trang va, tang van, thang va

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

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