Perhaps you should try some spelling variations:
nhan tain » nhan dan, nhan tao, han tai
mach hoc » cach hoc, dich hoc, anh hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
nhan tai » hang tai, van tai, toan tai
su mach » su sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
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 mach hoc tap, nghien cuu mon hoc dan khoa hoc ma hoi va ((nhan tain) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu mon hoc dan khoa hoc ma hoi va ((nhan tain) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu mon hoc dan khoa hoc ma hoi va ((nhan tain) or (nhan tai))*.