Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu quang » thieu quang, hieu quan, hieu qua
trinh van » trinh han, trinh quan, trinh toan
dung cong » dung trong
trinh va » trinh vat, trinh ve, trinh vi
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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) or (hieu quang)) - canh ((trinh va) or (trinh van)) dung cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (hieu quang)) - canh ((trinh va) OR (trinh van)) dung cong dan toan tap.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (hieu quang)) - canh ((trinh va) or (trinh van)) dung cong dan toan tap*.