After very long and unpleasant play with Google Analytics Query Explorer 2 i came with solution like this one which does right job.
filters=ga:pagePath==/firstURI,ga:pagePath==/secondURI
IMPORTANT NO SPACES between filters
Reference Documentation
Combining Filters
Filters can be combined using OR and AND boolean logic. This allows you to effectively extend the 128 character limit of a filter expression.
OR
The OR operator is defined using a comma (,). It takes precedence over the AND operator and may NOT be used to combine dimensions and metrics in the same expression.
Examples: (each must be URL encoded)
Country is either (United States OR Canada):
ga:country==United%20States,ga:country==Canada
Firefox users on (Windows OR Macintosh) operating systems:
ga:browser==Firefox;ga:operatingSystem==Windows,ga:operatingSystem==Macintosh
AND
The AND operator is defined using a semi-colon (;). It is preceded by the OR operator and CAN be used to combine dimensions and metrics in the same expression.
Examples: (each must be URL encoded)
Country is United States AND the browser is Firefox:
ga:country==United%20States;ga:browser==Firefox
Country is United States AND language does not start with 'en':
ga:country==United%20States;ga:language!~^en.*
Operating system is (Windows OR Macintosh) AND browser is (Firefox OR Chrome):
ga:operatingSystem==Windows,ga:operatingSystem==Macintosh;
ga:browser==Firefox,ga:browser==Chrome
Country is United States AND visits are greater than 5:
ga:country==United%20States;ga:visits>5