I have a spreadsheet with many rows. I want to sum a column based on the
contents of another column. No problem. With this formula, I can do that:

=SUMIF(Results,"2-In progress",TCV) where Results and TCV are named
ranges.

Now I want to complicate this by adding another layer of filtering. For all
cells that match the above criterion, I want to add another test that says I
only want a subset of these records that match a string in another column.
So I want to add the TCV for all cells that match "xxx" in the range Results
further refined by matching the cells that match "yyy" in the range Sector.

I have tried many variations on formulas but can't seem to find a
combination that works. Any idea?