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
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
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 (nang 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 (nang ma)) hoi. hieu va dau thuc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach thu)) ((nang xa) OR (nang 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 (nang ma)) hoi. hieu va dau thuc va hanh vai cua tre*.