Perhaps you should try some spelling variations:
khanh ban » khanh van, thanh ban, khanh luan
nuoc van » nuoc va, luoc van, nuoc dan
nuoc san » nuoc luan, nguoi san, nuoc quan
te sach » toc sach
ban cua » ban quan
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
co hai » co dai, o hai, so hai
va hac » van hac, va khac, va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((co hoi) or (co hai)). lieu va hac ((nuoc van) OR (nuoc san)) khanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((co hoi) OR (co hai)). lieu va hac ((nuoc van) OR (nuoc san)) khanh ban cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((co hoi) or (co hai)). lieu va hac ((nuoc van) OR (nuoc san)) khanh ban cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((co hoi) or (co hai)). lieu va hac ((nuoc van) OR (nuoc san)) khanh ban cua tre*.