Some products/ingredients are manufactured and sold under the same name but different brands, and also do not have the same nutritional values. It is therefore difficult to choose between equally named ingredients when searching for one.
The list obtained after a search in the nutrition tab should also display the brand, as fetched from eg. OpenFoodFacts. And the details panel too.
Maybe even, the search input could have a separate field for brand ? At least, search should also operate on brands : it is often quicker that way, because not so many brands will sell products with the same name but different nutritional values (at least in a given country).
More generally, inspiration, and maybe even some code, could be taken from the Energize app, which has way less features than wger but imho a better interface for food logging (including responsiveness).