Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cao xuc » cam xuc, cao duc, cao suc
hieu va » lieu va, hieu qua
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
va cao » va cac, va co, va dao
ha hoi » ha noi, xa hoi, va hoi
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 (hoc sach)) ky lang ((ha hoi) OR (hoa 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 (hoc sach)) ky lang ((ha hoi) OR (hoa 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 (hoc sach)) ky lang ((ha hoi) OR (hoa hoi)). hieu va cao xuc va hanh vai cua tre*".