Champion and Item icon searching algorithm/structure question

So when you look up a champion say you can use a substring such as "lyn" and be given caitlyn and evelynn as possible options. This includes looking up a champion like with "Kench", presumably meaning an algorithm would include the space character ' '.

This also goes for items as well. I can look up the word "of" you get a list of items with substring in the name or a stat (e.g. "power" gives ability power)... with one exception So i did a few other tests, i tried "of damage" which gives you all the items with the word "of", but also still even though the substring "of" is not anywhere in the description, name, or stats (Also the "lots of damage" from the flavor text doesn't bring up tri force, which is where i assumed the false flag was from initially).

Though, probably the most curious example i found was "sin" when searching for champions. Just try it yourself. Maybe they use the lore text in the matching database?

This is more of an inquiry than feedback, but i was wondering. Is this just some abnormality in how the champion names are stored, the substring algorithm that you guys are using for the search, or is it some combination system, which defaults to the largest substring available, then divides the given string into parts and searches based on spaces and/or portions of the substring.

Just wondering from the technical aspect what's going on. Nothing serious or website breaking just an interesting bug.