Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van dinh » van minh, van dich, xuan dinh
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cao xuc » cam xuc, cao duc, cao suc
va dinh » va kinh, va tinh, vu dinh
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
vi cua » vai cua, di cua

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 ky ((nang x) OR (nang cao)) hoi. hieu va cao xuc ((va dinh) OR (van dinh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky ((nang x) OR (nang cao)) hoi. hieu va cao xuc ((va dinh) OR (van dinh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky ((nang x) OR (nang cao)) hoi. hieu va cao xuc ((va dinh) OR (van dinh)) vi cua tre*.