Perhaps you should try some spelling variations:
dinh chi » dinh thi, dinh tri, dinh moi
nang doc » nang luc
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
banh di » danh di, xanh di, banh chi
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: tu sach ty ((nang o) or (nang doc)) hai. hieu va cam duc ban ((banh di) or (dinh chi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang o) OR (nang doc)) hai. hieu va cam duc ban ((banh di) OR (dinh chi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang o) or (nang doc)) hai. hieu va cam duc ban ((banh di) or (dinh chi)) cua tre*.