Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
nghien huu » nghien cuu, nguyen huu, nhiem huu
nhan khong » nhan thong, nhanh chong, nganh khong
mach hoc » cach hoc, dich hoc, bac hoc
hoc nhan » hoc nhanh, nhoc nhan, hoc phan
thuoc la » thuoc ma, thuoc va, thuoc tai
nhan dan » phan dau, gian dan, nhan tai
anh hoc » sinh hoc, benh hoc, hinh hoc
huu hoa » huu ho, huu hoi, uu hoa
la hoi » lai hoi, xa hoi, le hoi
hoi ca » hoi cua, hoi cac, hoi cau

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 (anh hoc)) tap, nghien huu hoa hoc nhan khong thuoc la hoi ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (anh hoc)) tap, nghien huu hoa hoc nhan khong thuoc la hoi ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (anh hoc)) tap, nghien huu hoa hoc nhan khong thuoc la hoi ca nhan dan*.