Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
thai cuu » thai cua, tai cuc, thi cuc
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
sach ky » sach y, sach ty, sach kem
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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 ((o hoi) OR (o hai)). hieu ve cac vuc van khanh thai cuu tre~.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang ((o hoi) or (o hai)). hieu ve cac vuc van khanh thai cuu tre*.