Perhaps you should try some spelling variations:
viec bach » viec ban, viec bao, viet sach
ban hang » ngan hang
dang xay » dang van, van xay
xuc ban » duc ban, cuc ban, quoc ban
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
dang xa » lang xa, dang ha, dang va
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((dang xa) OR (dang xay)) hoi. hieu ((viec bach) or (vien bach)) xuc ban hang va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang xa) OR (dang xay)) hoi. hieu ((viec bach) OR (vien bach)) xuc ban hang va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((dang xa) OR (dang xay)) hoi. hieu ((viec bach) or (vien bach)) xuc ban hang va cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang xa) OR (dang xay)) hoi. hieu ((viec bach) or (vien bach)) xuc ban hang va cuu tre*.