Perhaps you should try some spelling variations:
khanh thi » nhanh thi, khanh thu, nhanh thai
van khanh » van thanh, van hanh, van anh
cuoc van » cuoi van, luoc van, quoc van
cac cuoc » cac nuoc, ca cuoc, cac quoc
tu sach » thu sach, te sach, tu cach
thi cua » thai cua, thi cuc, tri cua
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
ve cac » va cac, vien cac
so hai » son hai, su hai, so ha
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) or (su sach)) ky nang ((o hoi) or (so hai)). hieu ve cac cuoc van khanh thi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ((o hoi) OR (so hai)). hieu ve cac cuoc van khanh thi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ((o hoi) or (so hai)). hieu ve cac cuoc van khanh thi cua tre*.