Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
sach ky » sach y, sach ty, sach kem
xuc ban » duc ban, cuc ban, xuat ban
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
va cao » va cac, va co, va dao
di cua » dai cua, doi cua, de cua

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: tu ((sach ky) OR (sac ky)) nang x ho. lieu va cao ((xuc ban) OR (quoc ban)) hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang x ho. lieu va cao ((xuc ban) OR (quoc ban)) hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x ho. lieu va cao ((xuc ban) OR (quoc ban)) hanh di cua tre*.