Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
cua chong » cua cong, cua chung, cua khong
tang cua » mang cua, hang cua, tang luan
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
han tap » han tai, toan tap, nhan tai

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 lang) or (chiet tach)) - hanh tang cua chong ((cong tan) OR (cong san)) han tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chiet tach)) - hanh tang cua chong ((cong tan) OR (cong san)) han tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (chiet tach)) - hanh tang cua chong ((cong tan) OR (cong san)) han tap".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chiet tach)) - hanh tang cua chong ((cong tan) OR (cong san)) han tap*.