Currently we cannot see what people are searching on in self service, and therefor can create new Knowledge articles or service request to fulfill the needs of client. As we speak we don't have a clue what people search for.
Store the search words or string that clients enter on Self Service. This can be valuable input. On top at a treshold, let's say 10, when it''s reached create an incident to create a suitable knowledge article or service request so that next time people find what they are looking for on self service.