Your tracking info was not found, the possible reasons are:
1: The carrier hasn't accepted your package yet.
2: The carrier hasn't scanned and entered your package tracking information into their system yet.
3: Your tracking number is incorrect or invalid.

I have checked with seller, due to holiday there was delay. But they have already sent post, they said before 1 week.

The tracking number seems to be a valid one but not sure where there is no tracking information in China Post tracking system. You'd better contct the seller to ask him what kind of ways he uses to send it. If it's registered? If it's registered, it can be tracked. Ask him if he could find where the package is now.