Then try Salgud's tip "Due before tomorrow". That's just one line. I know it works, too.
In general, to add AND's and OR's, you have the following three controls:
- the Add rule button, located at the far right bottom:
This adds another "box" of conditions. (When you start up a new search you have two "boxes" that actually look more like darker blue lines than boxes.)
- the gray semi-circular symbol located just left of the gray cross at the far right on each line:
This adds one more condition inside that "box". (This makes it look more "boxy" - an area of several lines sharing the same background color.)
- the dropdown All/Any selector at the top left.
With All selected, you get AND conditions between the "boxes" and OR conditions between the conditions within the boxes. With Any selected, it is the other way around.