Perhaps you should try some spelling variations:
hoc sach » hoc anh
hanh tai » thanh tai, hang tai, han tai
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri 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
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
hoc cac » hoc cao
ha hoi » hoa hoi, ha noi, xa hoi
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.

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