Perhaps you should try some spelling variations:
toan toan » toan tran, thanh toan, toan doanh
thanh van » thanh san, thanh toan, thanh phan
mach hoc » cach hoc, dich hoc, anh hoc
mot toan » mon toan, mot thanh, mot doanh
khoa hoc » hoa hoc
ke mach » ke hoach
cuu mot » cua mot, cuu mo, huu mot
hoi dan » hoa dan, hoc dan, thoi dai
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: ke mach hoc tap, nghien cuu mot toan toan khoa hoc xa ((hoi dan) OR (hoi dap)) thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ke mach hoc tap, nghien cuu mot toan toan khoa hoc xa ((hoi dan) OR (hoi dap)) thanh van".
• Adding a wildcard symbol may retrieve word variants: ke mach hoc tap, nghien cuu mot toan toan khoa hoc xa ((hoi dan) OR (hoi dap)) thanh van*.