Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
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: thu sach ky nang x ho. hieu van cac ((xuc va) OR (tuc va)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x ho. hieu van cac ((xuc va) OR (tuc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. hieu van cac ((xuc va) OR (tuc va)) hanh vi cua tre*.