Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
nhan tain » nhan dan, nhan tao, han tai
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 tai » hang tai, van tai, toan tai
su sach » so sach, vu sach
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 tap, nghien cuu dong hoc nganh khoa hoc ma hoi va ((nhan tain) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien cuu dong hoc nganh khoa hoc ma hoi va ((nhan tain) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu dong hoc nganh khoa hoc ma hoi va ((nhan tain) or (nhan tai))*.