Perhaps you should try some spelling variations:
quang cong » quang cuong, quang dong, quang hoang
quan tran » quang tran, quan tren, xuan tran
hoc sach » hoc sinh, hoc cac, hoc anh
anh quan » anh tuan, ban quan, anh nhan
cong tap » cuong tap, cong tac, cong tan
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
co sach » bo sach, cuon sach

You may be able to get more results by adjusting your search query.

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