Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
thanh hung » thanh huong, thanh tung, thanh cong
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, nhanh quang
cong tap » cuong tap, cong tac, cong tan
quan cau » quang cao, quan ha, quan cua
toan cau » toan cao, toan ban, toan tap

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