Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nhanh khoa » nhan khoa, nganh khoa, hang khoa
hoc nhanh » hoc nganh, hoc phan
mach hoc » cach hoc, anh hoc, bac hoc
dich hoc » sinh hoc, hinh hoc, tinh hoc
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
va nhan » van nhan, ca nhan, va phan
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: tu ((mach hoc) or (dich hoc)) tai, nghien huu mot hoc nhanh khoa hoc ma hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (dich hoc)) tai, nghien huu mot hoc nhanh khoa hoc ma hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (dich hoc)) tai, nghien huu mot hoc nhanh khoa hoc ma hoi va nhan dan*.