in hebrew, double quotes is often used to denote acronyms. e.g., [[he:Category:כדורגלני בית"ר ירושלים]].
afaicr, the "old" search allowed for this by interpreting double-double-quotes ("") as "escaped" double quotes, so you would search for
incategory:"כדורגלני בית""ר ירושלים"
cirrus search does not allow this.
i may be mistaken WRT old search (is there a way to test old search on hewiki?), but i know it *is* broken with cirrus.