Perhaps you should try some spelling variations:
khanh tai » thanh tai, hanh tai, nhanh thai
van khanh » van thanh, van hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
su sach » vu sach
xuc van » duc van, luc van, vuc van
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
cuc tre » duc tre, cua tre, cuu tre
so sach » so sanh, bo sach, co sach
co hai » co dai, co hoi, o hai
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) ky nang ((o hoc) or (co hai)). hieu ve chat xuc van khanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang ((o hoc) OR (co hai)). hieu ve chat xuc van khanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang ((o hoc) or (co hai)). hieu ve chat xuc van khanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang ((o hoc) or (co hai)). hieu ve chat xuc van khanh tai cuc tre*.