Perhaps you should try some spelling variations:
nghiem thuoc » nghiem duoc, nghiem hoa, nghi thuc
nganh khung » nganh khong, nhanh hung
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
thanh van » thanh san, thanh toan, thanh phan
hoc nganh » hoc nhanh
ban thanh » ban hanh, ban hang
khung hoc » chung hoc, nhung hoc, thuong hoc
cong hoc » dong hoc, cong hoa, cong coc
sach hoc » cach hoc, sach hoi, mach hoc
te sach » toc sach
hoc xa » hoc ma
di ban » dia ban, doi ban, di san
xa di » xa dai, pa di, xa do

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

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