When for example trying to filter on multiple conditions for one item they are evaluated as AND. There should be an option to be able to select if you want to choose AND or OR operator for condition values.
For example: You want to filter objects by attribute values A and B and other possible values are C,D,E...
If you set up a condition for:
Attribute X = A
Attribute X = B
You do not get any results as there is no such combination.
when you adding condition for attribute value... add options:
does not contain
<> / != (not equal)