You shouldn’t need to type Pāli letters in the search to find suttas, but if you like to type the letters with the diacritics, here is a simple piece of software that lets you type them on Windows computers. It’s just a single file that runs but does not install on Windows computers.
Once you run the program, you will see a chart of what keys to type to get the letters you need. To see the chart again, double click on the “ṁ” icon in the tray:
This small program is created by software called AutoHotKey. If you want to try using the original script, you can download it here. Note that you will need to install AutoHotKey to get this script to work. That is not necessary if you download the exe file above.