Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
khong hoc » khung hoc, thong hoc, khong thuoc
sach hoc » cach hoc, sach hoi, mach hoc
hoc phan » hoc dan, hoc pho
mau gian » mau giao, hau giang, dan gian
gian dan » gian lang
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
hoa mau » hoa may, hoa cau, hoa dau

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 mon ((hoc nganh) or (hoc phan)) khong hoc ma hoa mau gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu mon ((hoc nganh) OR (hoc phan)) khong hoc ma hoa mau gian dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mon ((hoc nganh) or (hoc phan)) khong hoc ma hoa mau gian dan*.