Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
y sang » duy sang
_ sang » _ san
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac

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