Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
dat cua » dai cua, day cua, mat cua
duc gia » quoc gia
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
ve cac » va cac, vien cac
y nang » ky nang, v nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa

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