Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dinh dat » dinh ket, dinh van, dinh lam
dinh dai » sinh dai, dinh dao, dinh tai
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
va thai » van thai, va tai, va tham
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, tuc xa, duc va
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. lieu va thai ((tuc va) or (truc va)) ((dinh dai) OR (dinh dat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ma hoi. lieu va thai ((tuc va) OR (truc va)) ((dinh dai) OR (dinh dat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang ma hoi. lieu va thai ((tuc va) or (truc va)) ((dinh dai) OR (dinh dat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ma hoi. lieu va thai ((tuc va) or (truc va)) ((dinh dai) OR (dinh dat)) cua tre*.