Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
toc sach » hoc sach, doc sach, thuoc sach
danh sai » dung sai, danh bat, danh dau
cua nuoc » cua quoc, cua nguoi, cua thuoc
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
nam xuc » cam xuc, nam xua, nam thuc
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
va nam » van nam, ha nam, va nay
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thu sach)) ky nang o hoc. hieu va nam xuc va ((doanh van) or (danh sai)) cua nuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) ky nang o hoc. hieu va nam xuc va ((doanh van) OR (danh sai)) cua nuoc.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) ky nang o hoc. hieu va nam xuc va ((doanh van) or (danh sai)) cua nuoc*.