Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
trinh vi » trinh va, trinh ve, trinh viet
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - hanh ((trinh vat) or (trinh vi)) dung cong ((dan than) or (dan chan)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trinh vat) OR (trinh vi)) dung cong ((dan than) OR (dan chan)) cap.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trinh vat) or (trinh vi)) dung cong ((dan than) or (dan chan)) cap*.