Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
hoc nganh » hoc nhanh
khong hoc » khung hoc, thong hoc, khong thuoc
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
gian dan » gian lang
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va gian » va gianh, van gian, va giai
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach hoc) or (mach hoc)) tap, nghien cuu mon hoc nganh khong hoc ma hoi va gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach hoc) OR (mach hoc)) tap, nghien cuu mon hoc nganh khong hoc ma hoi va gian dan.
• Adding a wildcard symbol may retrieve word variants: su ((sach hoc) or (mach hoc)) tap, nghien cuu mon hoc nganh khong hoc ma hoi va gian dan*.