Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hanh vai » hanh vi, hanh va, hanh tai
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cao xuc » cam xuc, cao duc, cao suc
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
va cao » va cac, va co, va dao
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 sinh) or (nuoc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va cao xuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sinh) OR (nuoc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va cao xuc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sinh) or (nuoc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va cao xuc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((hoc sinh) or (nuoc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va cao xuc va hanh vai cua tre*.