Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van tham » van thanh, van tuan, van tai
van chat » cao chat
vat dinh » va dinh, van dinh, vat sinh
dinh dat » dinh ket, dinh van, dinh lam
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. thien ((van tham) or (van chat)) thuc vat dinh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. thien ((van tham) OR (van chat)) thuc vat dinh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. thien ((van tham) or (van chat)) thuc vat dinh dat cua tre*.