Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
va hanh » va thanh, va danh, ban hanh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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 (thuoc sach)) ky dang xa hoi. hieu ve cac tuc ((va hanh) OR (van hanh)) dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ky dang xa hoi. hieu ve cac tuc ((va hanh) OR (van hanh)) dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ky dang xa hoi. hieu ve cac tuc ((va hanh) OR (van hanh)) dai cua tre*.