There are several helpful tools for finding constitutions online and in print:
The general sources discussed on the Getting Started page are a good reference point for getting started finding legislation online. Many link to countries' legislature websites, where they might have copies of their laws in the vernacular, English translation, or both.
But there are several other resources you could check:
The general sources on the Getting Started page are also a good reference point for locating case law. Many link to countries' important courts, which may have copies of some or all court decisions. The most helpful of these for finding case law for certain jurisdictions is Worldlii.