Easiest to explain with a specific example, but the issue is more general…
Let’s say I want to search for transactions with Sainsbury’s Bank. When pressing space bar after Sainsbury’s Monzo makes the assumption I want to search for the merchant “Sainsbury’s”. When I then type bank the eventual search does not identify transactions with “Sainsbury’s bank”. It identifies transactions with Sainsbury’s that has the word bank in a searchable field
Attempting to use quotation marks around the search term does not affect behaviour.
There are likely multiple ways the behaviour could be improved. A couple of options:
After typing the word Sainsbury’s Monzo could offer a list of all merchants that contain the word Sainsbury’s (which the user would then pick from) instead of making an assumption.
If starting a search with a quotation mark Monzo could avoid trying to match words to merchants and perform a whole phrase search instead.