Search Two Tables Based On Multiple Criteria

Hi All,

I have been stuck on this for awhile and any help would be appreciated:

On one table I have 

In a Master Table, I have in a dataverse:

I have used the following calculation to try and get a search match, which works when selecting one value but as soon as you select more than one from the dropdown, it reverts to everything that is in both tables which is what I do not want to occur.

Filter = 
VAR searchproject =
EXACT(
        SELECTEDVALUE ( Master[Project ID] ),
        SELECTEDVALUE ( Values[Project ID] )
    )


VAR searchworkstream =
EXACT(
        SELECTEDVALUE ( Master[Workstream ID] ),
        SELECTEDVALUE ( Values[Workstream ID] )
    )

RETURN
If(HASONEVALUE(Workstream[Workstream ID]) && searchworkstream>0, "Found",
If(NOT HASONEVALUE(Workstream[Workstream ID]) && searchproject>0,"Found"))

Any idea how I can get the following example:

Select Project 1001 and 98 from a dropdown filter connected to the Master Table and then show a value of 11?

Note I cant do a simple join because some users aren't inputting their information at the workstream level.

Any help is greatly appreciated!