Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
hoc nhanh » hoc nganh, hoc phan
nhanh hoa » nhanh hoan, thanh hoa, khanh hoa
mach hoc » cach hoc, dich hoc, bac hoc
tung hoc » trung hoc, tuong hoc, dung hoc
dan nhan » danh nhan, dan chan, van nhan
nhan tai » hang tai, van tai, toan tai
anh hoc » sinh hoc, benh hoc, hinh hoc
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((mach hoc) or (anh hoc)) tap, nghien huu tung hoc nhanh hoa hoc xa hoc dan nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((mach hoc) OR (anh hoc)) tap, nghien huu tung hoc nhanh hoa hoc xa hoc dan nhan tai.
• Adding a wildcard symbol may retrieve word variants: thuat ((mach hoc) or (anh hoc)) tap, nghien huu tung hoc nhanh hoa hoc xa hoc dan nhan tai*.