We have an attribute with Multilist as extended attribute and when we perform search the condition it is using is 'Contains One' by giving target value. In the Target value as it is multilist i am selecting A & B. Then the search results are specs with value A and Specs with value B as the condition is Contains One.
Suppose we have a Spec with attribute value containing both A&B then the search will be performed and there is no other condition also other than Contains one condition. How to perform a search to get spec which is having A&B .
A contains all search for extended attributes is a very costly operation so there is no great way to provide this as a generic solution without extreme limitations. I recommend you create customized views for the searches you would like to support and use a reporting solution like BI publisher.