Join two search results

I am trying to join two search results with the common field project.

Here is an example:

First result would return for Phase-I

project      sub-project         processed_timestamp
p1              sp11            5/12/13  2:10:45.344 PM
p1              sp12            5/13/13 12:11:45.344 PM
p1              sp13            5/13/13  2:10:45.344 PM

p2              sp21            6/23/13 12:10:45.344 PM
p2              sp22            6/24/13 12:10:45.344 PM

p3              sp31            7/23/13 12:10:45.344 PM
p3              sp32            7/24/13 12:10:45.344 PM

p4              sp41            7/23/13 12:10:45.344 PM

project      sub-project         processed_timestamp
p1              sp11            6/12/13  2:10:45.344 PM
p1              sp12            6/13/13 12:11:45.344 PM

p2              sp21            7/23/13 12:10:45.344 PM
p2              sp22            7/24/13 12:10:45.344 PM

Here is the output I am looking for

project         phaseI_start                    phaseI_end              phaseII_start                   phaseII_end
p1      5/12/13  2:10:45.344 PM     5/13/13  2:10:45.344 PM     6/12/13  2:10:45.344 PM     6/13/13 12:11:45.344 PM
p2      6/23/13 12:10:45.344 PM     6/24/13 12:10:45.344 PM     7/23/13 12:10:45.344 PM     7/24/13 12:10:45.344 PM
p3      7/23/13 12:10:45.344 PM     7/24/13 12:10:45.344 PM
p4      7/23/13 12:10:45.344 PM     7/23/13 12:10:45.344 PM (has only one sub project so sametime applies to start and end)

I tried using transaction for each searches separately and used join as follows:

sourcetype="A"| transaction project |eval phaseI_start= ...|eval phaseI_end = .....| fields project, phaseI_start, phaseI_end| join project [search sourcetype="B"| transaction project |eval phaseII_start= ...|eval phaseII_end = .....| fields project, phaseII_start, phaseII_end]

I donot get any result back. However if I apply filter to get specific projects using "where like (project,"P1%") in both searches then it works. First search would return more than 10000 records and second would return about 5000.

Thanks,

Sanjay