Perhaps you should try some spelling variations:
khanh thanh » nhanh thanh, thanh thanh, phan thanh
thanh cua » tranh cua, than cua, hanh cua
van khanh » van thanh, van hanh, van anh
thien van » thi van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, chat xuc, cac cuoc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
o lai » o lao
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((o hoi) or (o lai)). thien van ((cac xuc) or (cac nuoc)) van khanh thanh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (o lai)). thien van ((cac xuc) OR (cac nuoc)) van khanh thanh cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (o lai)). thien van ((cac xuc) or (cac nuoc)) van khanh thanh cua tre*.