Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
giai thanh » gia thanh, gian thanh, giay thanh
thanh toan » thanh hoa, thanh san, tinh toan
sach toi » sach doi, sach hoi, sach moi
dong hoc » dong co, dong luc
toan hoc » toan khoa, van hoc, hoa hoc
khoa hoc » hoa hoc
hoc giai » hoc giao, hoc dai, so giai
te sach » toc sach
toi gap » toi tap, toi gian
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa hoa

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 toi gap, nghien cuu ((dong hoc) or (toan hoc)) nganh khoa hoc xa hoc giai thanh toan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach toi gap, nghien cuu ((dong hoc) OR (toan hoc)) nganh khoa hoc xa hoc giai thanh toan.
• Adding a wildcard symbol may retrieve word variants: te sach toi gap, nghien cuu ((dong hoc) or (toan hoc)) nganh khoa hoc xa hoc giai thanh toan*.