Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
nhan taon » nhan trong, nhan thong, nhan tuong
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
nhan tao » nhan tai, nhan dan
tu sach » thu sach, su sach, te sach
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 dong hoc nganh khoa hoc xa hoi va ((nhan taon) or (nhan tao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong hoc nganh khoa hoc xa hoi va ((nhan taon) OR (nhan tao)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong hoc nganh khoa hoc xa hoi va ((nhan taon) or (nhan tao))*.