To my experience it is not possible to add wildcards in the product search in MPOS/ CPOS (*, %, etc.) This limits the results to the beginning of a criteria. Ex. a search for "ball" will give a result for "ballpark" but not "baseball". In Norway, for instance, we do not divide compounded words. For instance "swimming trunks" is "badebukse" not "bade bukse". If you try to search for "bukse" there will be no result.