Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, ban hanh
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
tai cua » thai cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, cao suc
va danh » va dinh, va dan, dia danh
ha hoi » hoa hoi, ha noi, xa hoi
va cao » va cac, va co, va dao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sinh) OR (hoc sach)) ky lang ha hoi. hieu va cao xuc ((va hanh) OR (va danh)) tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sinh) or (hoc sach)) ky lang ha hoi. hieu va cao xuc ((va hanh) OR (va danh)) tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((hoc sinh) or (hoc sach)) ky lang ha hoi. hieu va cao xuc ((va hanh) OR (va danh)) tai cua tre*.