Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
dang thanh » dong thanh, dang hanh, hoang thanh
dan thanh » danh thanh, ban thanh, van thanh
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
ke mach » ke hoach
cuu mot » cua mot, cuu mo, huu mot
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 thanh toan khoa hoc xa hoi ((dan thanh) or (dang thanh)) san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ke mach hoc tap, nghien cuu mot thanh toan khoa hoc xa hoi ((dan thanh) OR (dang thanh)) san.
• Adding a wildcard symbol may retrieve word variants: ke mach hoc tap, nghien cuu mot thanh toan khoa hoc xa hoi ((dan thanh) or (dang thanh)) san*.