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 luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
dung cong » dung trong
san chan » san chang, dan chan, san chay
van chat » cao 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 van)) dung cong ((san chan) or (van chat)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh ((trinh vat) OR (trinh van)) dung cong ((san chan) OR (van chat)) ban.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trinh vat) or (trinh van)) dung cong ((san chan) or (van chat)) ban*.