In fact, you can’t use their search to do so, but there are three ways to achieve this:
- URL Schemes
- List filtering
- Shortcuts
URL Schemes
The trick is to ask for a show command and input a list and some filter parameters. Say I want to see tasks from Today view that have both Tag 1 and Tag 2. Here’s the URL:
things:///show?id=today&filter=Tag%201%2CTag%202
A limitation of this approach is that you can’t search for either (OR) tag. It will only work for all tags selected (AND).
Things URL builder will help with both the encoding and the documentation. I made some URLs to help me with comms and errands and have them embedded in the notes field of my calendar entries for such tasks. (More used URLs could be saved to your text expansion of choice and even Text Replacement for triggering via iPhone/iPad/macOS).
List Filtering
- Move to the list (say, Today);
- Select the
Filter by Tag(or tags, but keep in mind the AND limitation as per above);
Specifics on how to filter will change across plataforms.
This way you’ll have only items on that list with such tag(s).
Bônus: it can be sped up even further if you have set keyboard shortcuts for your tags (unfortunately, setting them seems to be available only on macOS, but using it can be done on iPad with an external keyboard as well).
Shortcuts
It will now work on macOS as well.