Perhaps you should try some spelling variations:
voi doanh » von doanh, tri doanh, hoa doanh
tan khoa » toan khoa, tran khoa, san khoa
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
vu sach » vu bach, su sach, vu khach
hoi tap » hoi dap, hoc tap, hai tap
hoi tai » hoc tai, hoi trac
hoc tan » hoc tang, hoc dan, hoc tap
mo hoc » mon hoc, co hoc
hoc xa » hoc ma
xa voi » xa hoi, ba voi, da voi

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((hoi tap) OR (hoi tai)), nghien cuu mo hoc tan khoa hoc xa voi doanh nhan dan~".
• Adding a wildcard symbol may retrieve word variants: vu sach ((hoi tap) OR (hoi tai)), nghien cuu mo hoc tan khoa hoc xa voi doanh nhan dan*.