Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
cong toan » cong tan, cong hoan, cong tuan
van thanh » ban thanh, van tuan
benh hoc » sinh hoc
cuu cong » cua cong, thu cong, cac cong
khoa hoc » hoa hoc
su benh » sau benh, so benh, su menh
co toan » co ton, so toan, bao toan
hoi van » hoi va, hoi dan, hai van
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su benh hoc tap, nghien cuu cong ((co toan) or (cong toan)) khoa hoc ma hoi van thanh toan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su benh hoc tap, nghien cuu cong ((co toan) OR (cong toan)) khoa hoc ma hoi van thanh toan.
• Adding a wildcard symbol may retrieve word variants: su benh hoc tap, nghien cuu cong ((co toan) or (cong toan)) khoa hoc ma hoi van thanh toan*.