Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
quang toan » quang tuan, quang tran, quang doan
doi chieu » doc hieu, doi chi, ho chieu
trinh qua » trinh quan, trinh cua, trinh quang
dung cong » dung trong
vang toan » van toan, dang toan, vang trang
tinh qua » tinh quan, tinh cua, sinh qua

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 - nhanh ((tinh qua) OR (trinh qua)) dung cong ((vang toan) or (quang toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - nhanh ((tinh qua) OR (trinh qua)) dung cong ((vang toan) OR (quang toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - nhanh ((tinh qua) OR (trinh qua)) dung cong ((vang toan) or (quang toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - nhanh ((tinh qua) OR (trinh qua)) dung cong ((vang toan) or (quang toan)) cau*.