Perhaps you should try some spelling variations:
va gianh » va gian, van giang, va thanh
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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