Perhaps you should try some spelling variations:
khanh tai » thanh tai, hanh tai, nhanh thai
van khanh » van thanh, van hanh, van anh
chat vuc » chat xuc, chat va, chat huu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
vuc van » duc van, luc van, thuc van
cuc tre » duc tre, cua tre, cuu tre
so hoc » co hoc, mo hoc, so hoa
co hai » co dai, co hoi, o hai
o hoc » co hoc, mo hoc, y 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 ky nang ((((o hoc) OR (so hoc))) or (co hai)). hieu ve chat vuc van khanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((((o hoc) OR (so hoc))) OR (co hai)). hieu ve chat vuc van khanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((((o hoc) OR (so hoc))) or (co hai)). hieu ve chat vuc van khanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((((o hoc) OR (so hoc))) or (co hai)). hieu ve chat vuc van khanh tai cuc tre*.