You must know the exact sequence of search expressions, otherwise you will get none or wrong results, e.g.
Searching for "Pro L20" will bring correct results. Search for "L20 Pro" will deliver no hits.
Same problem, if there would been another word between "l20" and "Pro", no hits would be deliver. Same as "IBM T60" or "Lenovo T60" delivers no results, even there are many in the database.
I would expect "Pro L20" to be interpreted as "Pro" AND "L20" and the sequence should not matter.
Tried also "Pro * L20", "Pro*L20" etc., no results.