Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
sach tong » sach song, sach rong, sach thuong
tong tap » tuong tac, trong tan, cong tac
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
phat van » pham van, phan van, phap van
tu sach » thu sach, su sach, te sach
mon hoc » toan hoc
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tong tap, nghien cuu ((mon hoc) or (dong hoc)) nganh khoa hoc xa hoi va phat van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tong tap, nghien cuu ((mon hoc) OR (dong hoc)) nganh khoa hoc xa hoi va phat van.
• Adding a wildcard symbol may retrieve word variants: tu sach tong tap, nghien cuu ((mon hoc) or (dong hoc)) nganh khoa hoc xa hoi va phat van*.