I use tags for travel. So when I went to Istanbul, every related cost was tagged #istanbul0518 (0518 means May 2018). That lets me search for #istanbul0518 and get a total for all spending when I was there, plus stuff like flights which I purchased in the UK in GBP.
Anyway, when I go into a purchase detail and click on the hyperlinked tag, it breaks up #istanbul0518 into two searches!