VMC administration (SM53) choose Log Administration -> Log Display.
A maximum of 1000 messages can be retrieved at one time. If more than 1000 messages exist, this is indicated in the status bar and you can scroll through them using the scrolling buttons in the function key menu bar.
After filtering the log criteria i have more than 1000 entries, is there any method to get more than 1000 entries from the log. Exporting to file isn't helping.