You're missing a closed parenthesis on the first index/match:
=IF(INDEX('DATA 1'!C:C;MATCH(OUTPUT!B13;'DATA 1'!A:A;0))="search";INDEX('DATA 1'!C:C;MATCH(B13;'DATA 1'!A:A;0));"Not available")
If you want multiple keywords, then combine them with Or()
, such as:
=If(Or(INDEX('DATA 1'!C:C;MATCH(OUTPUT!B13;'DATA 1'!A:A;0))="search",INDEX('DATA 1'!C:C;MATCH(OUTPUT!B13;'DATA 1'!A:A;0))="display"),INDEX('DATA 1'!C:C;MATCH(OUTPUT!B13;'DATA 1'!A:A;0)),"")
But maybe index/match isn't the most optimal way to do what you're trying to get after. Can you explain a little more (edit your OP), what you're trying to do so we can avoid an XY problem?