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
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
tu mach » tu cach, tu manh, tu hach
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 dong hoc doanh khoa hoc xa hoi va ((gian lang) OR (gian dan))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cuu dong hoc doanh khoa hoc xa hoi va ((gian lang) OR (gian dan))".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu dong hoc doanh khoa hoc xa hoi va ((gian lang) OR (gian dan))*.