Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
hoc nganh » hoc nhanh
thuoc mai » thuoc ma, thuoc tai, thuoc moi
sach hoc » cach hoc, sach hoi, mach hoc
cam nhan » cam chan, cam nang, cu nhan
su sach » so sach, vu sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
mai hoi » mai khoi, dai hoi, lai hoi

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 tap, nghien cuu mon hoc nganh khong thuoc mai hoi ((cam nhan) or (ca nhan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien cuu mon hoc nganh khong thuoc mai hoi ((cam nhan) OR (ca nhan)) van.
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu mon hoc nganh khong thuoc mai hoi ((cam nhan) or (ca nhan)) van*.