Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
quang tuan » quang thanh, quan luan, quang cua
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, nhanh quang
tuan hung » tran hung, luan hung, tuan dung
hung cong » nhung cong, hung cuong, phung cong
hai toan » hai tan, hach toan, thai doan

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 - anh quang tuan hung cong ((hai toan) or (((bai toan) OR (bai tap)))) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - anh quang tuan hung cong ((hai toan) OR (((bai toan) OR (bai tap)))) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - anh quang tuan hung cong ((hai toan) or (((bai toan) OR (bai tap)))) cao".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh quang tuan hung cong ((hai toan) or (((bai toan) OR (bai tap)))) cao*.