Perhaps you should try some spelling variations:
khanh thanh » nhanh thanh, thanh thanh, phan thanh
van khanh » van thanh, van hanh, van anh
thanh cu » thanh chu, thanh tu, thanh ca
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
te sach » toc sach
cac xuc » cam xuc, chat xuc, cac cuoc
cu tren » tu tren, dua tren
sach ky » sac ky, sach y, sach ty
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((o hoi) OR (o hai)). hieu ve ((cac xuc) OR (cac nuoc)) van khanh thanh cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((o hoi) or (o hai)). hieu ve ((cac xuc) OR (cac nuoc)) van khanh thanh cu tren~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((o hoi) or (o hai)). hieu ve ((cac xuc) OR (cac nuoc)) van khanh thanh cu tren*.