Perhaps you should try some spelling variations:
produc » product, produce, products
productettvity » producttettvity, producetettvity, productstettvity, producttvity, productivity, producitvity
producedts » productedts, produceedts, productsedts, produced, producers, produces
produzieren » reduzieren

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (produc OR (productettvity OR (produzieren OR producedts))).
• Adding a wildcard symbol may retrieve word variants: (produc or (productettvity or (produzieren or producedts)))*.