Perhaps you should try some spelling variations:
nganh khung » nganh khong, nhanh hung
nghien chu » nghien cuu, nghiep cau, nghiep che
hoc nganh » hoc nhanh
khung hoc » chung hoc, nhung hoc, thuong hoc
sach hoc » cach hoc, sach hoi, mach hoc
chu tuan » chu xuan, thu tuan, chu quang
tuan hoc » toan hoc, luan hoc, than hoc
nhan dan » gian dan, nhan tai
phan dau » phan tu, hang dau
tu sach » thu sach, su sach, te sach
hoc mai » hoc ma, hoc dai, hoc bai
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: tu sach hoc tap, nghien chu tuan hoc nganh khung hoc mai hoi va ((nhan dan) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien chu tuan hoc nganh khung hoc mai hoi va ((nhan dan) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien chu tuan hoc nganh khung hoc mai hoi va ((nhan dan) or (phan dau))*.