Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
ban thanh » ban hang
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
ban hanh » ban hang
cong so » cong san, cong hoa
so toan » so tan, so than, bao toan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach hoc tap, nghien thu cong so toan khoa hoc xa hai ((ban thanh) or (ban hanh)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach hoc tap, nghien thu cong so toan khoa hoc xa hai ((ban thanh) OR (ban hanh)) van.
• Adding a wildcard symbol may retrieve word variants: thuoc sach hoc tap, nghien thu cong so toan khoa hoc xa hai ((ban thanh) or (ban hanh)) van*.