There sure is. You can combine fields with an OR operator like this:
eg Content partner:
&or[content_partner][]=National+Library+of+New+Zealand&or[content_partner][]=TV3
eg Decade
&or[decade][]=2010&or[decade][]=2000
Doing both of the above at once is a little more complicated in that you have to nest parameters correctly to get the fields grouping and combining correctly:
&and[or][content_partner][]=National+Library+of+New+Zealand&and[or][content_partner][]=TV3&and[and][or][decade][]=2010&and[and][or][decade][]=2000
Which is essentially a couple (or more) of each of these
- `&and[or][content_partner][]=`
- `&and[and][or][decade][]=`
Hopefully that helps, let us know if there is anything else we can help with.
Cheers
Dan