Some of you might have heard of the reduced connection due to the Taiwan Earthquake. I am a new Asian user and I just checked that the system 'sent' me 29 tasks which I didn't receive (no record in my machine). I have been wondering whether there is a way to re-receive it.

nope

What you ask for is loosely called "Resending Lost Results", an option that Rosetta chooses not to employ because your lost results (or ghosts) will be sent to someone else. You will simply get new tasks to work on and you can forget about the ghosts. I personally have been getting ghosts since I joined the project in 2005.