Perhaps you should try some spelling variations:
khanh luan » khanh thuan, doanh luan, hang luan
van khanh » van thanh, van hanh, van anh
luan cua » quan cua, lua cua, luat cua
nuoc van » nuoc va, nuoc san, luoc van
te sach » toc sach
va khac » va khao, va kha, vu khac
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va hac » van hac, va cac, va hoc
co hai » co dai, o hai, so hai
co hoi » co hoc, co loi

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