Searching for a value inside the description, which is a translated text field, works in advanced search mode with the syntax:
You can provide the whole value as an exact match (including letter casing) or work with wildcards (value*). Be aware the first character of the value must match (b!=B) as you cannot start searching with a wildcard (see special characters and spaces). To ensure that you find something work with OR.
productInformation.description.en:(Blueberry* OR blueberry*)