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
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cac xuc » cam xuc, chat xuc, cac cuoc
cuu tre » cua tre, cau tren, cau treo
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ((o hoi) or (o hai)). hieu ve ((cac xuc) or (cac nuoc)) van khanh thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((o hoi) OR (o hai)). hieu ve ((cac xuc) OR (cac nuoc)) van khanh thai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((o hoi) or (o hai)). hieu ve ((cac xuc) or (cac nuoc)) van khanh thai cuu tre*.