Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dinh chi » dinh thi, dinh tri, dinh moi
nang doc » nang luc
cam duc » cam xuc, cao duc, pham duc
xanh di » danh di, vanh dai, xanh tai
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((nang o) or (nang doc)) hai. hieu va cam duc ban ((xanh di) or (dinh chi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang o) OR (nang doc)) hai. hieu va cam duc ban ((xanh di) OR (dinh chi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang o) or (nang doc)) hai. hieu va cam duc ban ((xanh di) or (dinh chi)) cua tre*.