Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang cai
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lai hoi » dai hoi, lai hoa, lai roi
hieu va » lieu va
thuc va » thuc dan, thuc day
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang lai hoi. ((hieu va) or (hieu qua)) nam ((thuc va) OR (thuc vat)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang lai hoi. ((hieu va) OR (hieu qua)) nam ((thuc va) OR (thuc vat)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang lai hoi. ((hieu va) or (hieu qua)) nam ((thuc va) OR (thuc vat)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang lai hoi. ((hieu va) or (hieu qua)) nam ((thuc va) OR (thuc vat)) hanh vai cua tre*.