Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cham tuc » nham thuc, pham thuc, tham thuc
tuc van » thuc van, truc van, tuc va
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty ((nang xa) OR (nang ma)) hoi. hieu va cham tuc van hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty ((nang xa) OR (nang ma)) hoi. hieu va cham tuc van hanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty ((nang xa) OR (nang ma)) hoi. hieu va cham tuc van hanh dai cua tre*.