Perhaps you should try some spelling variations:
hoi doanh » hoa doanh, voi doanh, doi doanh
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
cac toi » cac thoi
toi tap » toi gap, toan tap, tong tap
vu cac » va cac, tu cac, ve cac
mo hop » mo hoc, mo ho, so hop
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: vu cac toi tap, nghien cuu ((mo hop) or (co hoc)) toan khoa hoc xa hoi doanh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu cac toi tap, nghien cuu ((mo hop) OR (co hoc)) toan khoa hoc xa hoi doanh nhan dan.
• Adding a wildcard symbol may retrieve word variants: vu cac toi tap, nghien cuu ((mo hop) or (co hoc)) toan khoa hoc xa hoi doanh nhan dan*.