Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
cau thuc » cau truc, cuu thuc, can thuc
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach vu » sach va, sach tu, sach uu
hieu ve » hieu van
vu nang » vuc nang, va nang, vu dang
me hoi » le hoi

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