Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
dat cua » dai cua, day cua, mat cua
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
cua te » cua tu
y nang » ky nang, ly nang, may nang
ma hoi » mai hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang
du va » dau va, tu va, su va

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