Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, cuoc cach, cuon sach
hoc sach » hoc sinh, hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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

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