Perhaps you should try some spelling variations:
van dinh » van minh, van dich, va dinh
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
duc van » duc va, duc tan, duc manh
dinh le » dinh ve, dinh ly, dinh ket
ve cac » vien cac
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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 ((ve cac) OR (va cac)) duc van dinh le ((cua tu) OR (cua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty xang xa hoi. hieu ((ve cac) or (va cac)) duc van dinh le ((cua tu) OR (cua su))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ty xang xa hoi. hieu ((ve cac) or (va cac)) duc van dinh le ((cua tu) OR (cua su))*.