Many customers search for "leatherjacket", but my product data says "leather jacket".

FACT-Finder recognises “leatherjacket” and “leather jacket” as similar, but not, unfortunately, as 100% identical. In this case a preprocessor entry can help FACT-Finder:

leatherjacket -> leather jacket

If your shop has other products with this difficulty (for example, leatherpants), you can use a wildcard to create a more general entry:

leather* -> leather *