Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
gian dan » gian lang
tu mach » tu cach, tu manh, tu hach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma

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 tap, nghien cuu mon hoc doanh khoa hoc xa hoi va ((nhan va) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu mon hoc doanh khoa hoc xa hoi va ((nhan va) OR (gian dan)).
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu mon hoc doanh khoa hoc xa hoi va ((nhan va) or (gian dan))*.