Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
doanh khoa » toan khoa
mot doanh » mot thanh, hoa doanh, voi doanh
dan thanh » dang thanh, danh thanh, ban thanh
thanh van » thanh san, thanh toan, thanh phan
mach hoc » cach hoc, dich hoc, anh hoc
mot toan » mon toan, mot thanh, hop toan
khoa hoc » hoa hoc
te mach » ke mach, te sach, tim mach
hoi dan » hoa dan, hoc dan, hoi dap
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: te mach hoc tap, nghien cua ((mot toan) OR (mot doanh)) doanh khoa hoc xa hoi dan thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te mach hoc tap, nghien cua ((mot toan) OR (mot doanh)) doanh khoa hoc xa hoi dan thanh van".
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cua ((mot toan) OR (mot doanh)) doanh khoa hoc xa hoi dan thanh van*.