Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong hoc » khung hoc, thong hoc, khong thuoc
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » cong hoa, cong coc, cong ho
dong hoc » dong co, dong luc
tu sach » thu sach, su sach, te sach
va phan » van phan, va phat, va phap
phan va » phan van, nhan va, han va
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 hoc tap, nghien cuu ((cong hoc) OR (dong hoc)) nganh khong hoc xa hoi va phan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu ((cong hoc) OR (dong hoc)) nganh khong hoc xa hoi va phan va".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu ((cong hoc) OR (dong hoc)) nganh khong hoc xa hoi va phan va*.