Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh mang » nhanh mang, hanh trang, nhanh lang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - hanh mang ((cua cong) or (va nhung)) cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh mang ((cua cong) OR (va nhung)) cong dan than cao*.