Originally Posted by
citro
...
What am i doing wrong!
You are doing something wrong, so you need to keep trying until you understand how to use the search or call a travel agent to help you.
I have no trouble searching for a SYD-BER;BER-HEL;HEL-SYD in the multiple destinations search on the finnair site. With dates 2 dec/12dec/15dec it prices to 2256 AUD. Other dates are cheaper and below 2000AUD exists.