Perhaps you should try some spelling variations:
khanh ban » khanh van, thanh ban, khanh luan
van khanh » van thanh, van hanh, van anh
hac nuoc » hoc nuoc, cac nuoc, phap nuoc
nuoc van » nuoc va, nuoc san, luoc van
hieu van » hieu va, thien van, lieu va
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
van hac » van hoc, van ha, van hai
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
cua te » cua tu
o hai » co hai, so hai, o lai

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