Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
doanh van » doan van, doanh va, doanh ban
hieu van » hieu va, thien van, lieu va
duc vay » duc va, duc van, duc vy
cua tre » cua te, cua triet, dua tren
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. ((hieu ve) OR (hieu van)) pham duc vay doanh van ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. ((hieu ve) or (hieu van)) pham duc vay doanh van ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. ((hieu ve) or (hieu van)) pham duc vay doanh van ((cua tre) OR (cuu tre))*.