Perhaps you should try some spelling variations:
hoi doanh » hoa doanh, voi doanh, doi doanh
hoc toan » hoc tan, hop toan, hoa toan
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
vu sach » su sach, vu khach
hoi tap » hoi dap, hoc tap, hoi tai
mo hoc » mon hoc, co hoc
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 sach) or (vu bach)) hoi tap, nghien cuu mo hoc toan khoa hoc xa hoi doanh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu bach)) hoi tap, nghien cuu mo hoc toan khoa hoc xa hoi doanh nhan dan.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu bach)) hoi tap, nghien cuu mo hoc toan khoa hoc xa hoi doanh nhan dan*.