Search by string works incorrectly on Action log page

Steps to reproduce:
1) Navigate to Reports->Action log.
2) In "Search string" field add some text with spaces.
3) Check table.

Result:
Search - "Event at 2012.02.20 10:00:40 Hostname: H1 Value of item key1 > 20: PROBLEM"

Search - "Event at 2012.02.20 10:00:40"

Look like it searches by EVERY word not the whole text.

Expected:
If I am looking for - "Event at 2012.02.20 10:00:40", I want to see EXACTLY only action that has "Event at 2012.02.20 10:00:40". Not all actions that has words - Event or at or 10:00:40 e.t.c.