Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
thuc ban » thuoc ban, thuc dan, thu ban
ban dinh » ban tinh, van dinh, ban dich
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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: vu sach ty xang xa hoi. hieu va cau thuc ban dinh ((vi cua) OR (di cua)) te~.
• Adding a wildcard symbol may retrieve word variants: vu sach ty xang xa hoi. hieu va cau thuc ban dinh ((vi cua) or (di cua)) te*.