It’s “caselaw,” or “case law”, not “case laws,” no matter how many cases you’re discussing.
“Caselaw” is a mass noun and shouldn’t be pluralized. It’s not a count noun.
“Caselaw” means the “law to be found in the collection of reported cases that form all or part of the body of law within a jurisdiction.” Black’s Law Dictionary.
The word “caselaws” and the phrase “case laws” are not only bad English but also bad law.
Even Microsoft Word winces at “caselaws.”
If you mean “cases”, then just say “cases.”
