Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, va tinh, le thanh
te sach » toc sach
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
dat cua » dai cua, day cua, mat cua
y sang » duy sang
_ sang » _ san
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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: te sach ((y sang) OR (_ sang)) ma hoi. hieu van cac duc ((va thanh) OR (ban thanh)) dat cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y sang) or (_ sang)) ma hoi. hieu van cac duc ((va thanh) OR (ban thanh)) dat cua tu~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y sang) or (_ sang)) ma hoi. hieu van cac duc ((va thanh) OR (ban thanh)) dat cua tu*.