I am doing some research on Martin Luther. Because Luther calls original sin "person-sin," I did a search on "person-sin" (with the quotes).
I expected, because I used quotes around my search string, that the results would only list where "person-sin" was found. L4 did not return "person-sin". The results of my search returned matches on the following phrases: "personal sin," "person's sin," "person sins," personality. Sin," "person's sinful," and "personal sinfulness."
If a user enters in a search string in quotes, then the results of the search needs to match what is in the quotes.