Searching all the contents of patent documents depends on the patent claims and instructions.

The most basic, core and difficult rule in the interpretation of claims is how to use the specification and its drawings to interpret claims. The specification is used to explain the claims, and the claims should be understood from the perspective of technicians in this field, that is, the inventive purpose and specific examples of the specification can only be used to help understand the contents of the claims, and the specific examples of the specification cannot be "interpreted" into the claims, thus limiting the protection scope of the claims.