Perhaps you should try some spelling variations:
thang qua » thong qua, thang cua, thanh qua
thang mua » thang cua, than cua, thang va
dung cong » dung trong
cong san » cong tac
toan cao » toan tap
toan ban » van ban
co sach » bo sach, cuon sach, hoc sach
doi co » doi bo, moi co, hoi co

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 - thanh ((thang qua) OR (thang mua)) dung cong san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi co sach - thanh ((thang qua) OR (thang mua)) dung cong san ((toan cao) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi co sach - thanh ((thang qua) OR (thang mua)) dung cong san ((toan cao) or (toan ban))*".