I did put a support case and they told me that I should put it here for a feature request. So here it is:
Actual it does not find a film title when it is in a childprofile unless you unmark the Nest box sets. But by doing so you have masses of films with the same scans, I hate this. In my opinion a search for a title should find on the iPhone or iPad also films nested in childprofiles. This is the way the desktop application works, here it does find by searching for a title also the films nested in boxes, but not on the iPhone or iPad.
I request that this app does search the same way as the desktop application does.