Perhaps you should try some spelling variations:
khach hoi » khanh hoa, hoach hoi, sach hoi
hoi doanh » hoa doanh, voi doanh, doi doanh
vu khach » vu khanh, vu khac, vay khach
hoc toan » hoc tan, hop toan, hoa toan
nhan van » nhan dan, nhan va, phan van
hoi tap » hoi dap, hoc tap, hoi tai
mo hoc » mon hoc, co hoc

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

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