Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach thu » sach thue, sach thieu, sach tham
dau thuc » dan thuc, dai thuc, dam thuc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
va dau » va dao

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 ky) or (sach thu)) ((nang xa) or (tang ma)) hoi. hieu va dau thuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach thu)) ((nang xa) OR (tang ma)) hoi. hieu va dau thuc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach thu)) ((nang xa) or (tang ma)) hoi. hieu va dau thuc va hanh vai cua tre*.