Can't add much to your method, W. It's the way I do it, but then on the province level, e.g. "Noord-Holland Orphan 20cen".
Whatever method we use, there is no guarantee of 100% coverage with just one query. On the country level also "Nederland" and abbreviations like NLD and NL are used. With NL also in use as abbreviation of "Newfoundland and Labrador"...
Same goes for province abbreviations like NH, GE, etc. Also the biggest cities may have only their name recorded, Amsterdam, Rotterdam, Utrecht, etc.