Perhaps you should try some spelling variations:
doanh khung » doanh chung, doanh nhung, doanh thuong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoc doanh » hoa doanh, hoc danh, hoc dan
khung hoc » chung hoc, nhung hoc, thuong hoc
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
xoa doi » hoa doi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach hoc tap, nghien thu cong hoc doanh khung hoc ((va doc) or (xoa doi)) ban thanh pho~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach hoc tap, nghien thu cong hoc doanh khung hoc ((va doc) OR (xoa doi)) ban thanh pho.
• Adding a wildcard symbol may retrieve word variants: toc sach hoc tap, nghien thu cong hoc doanh khung hoc ((va doc) or (xoa doi)) ban thanh pho*.