The name of a localisation is not unique (even in a country), for instance a city 'London' exists in UK but also in Ontario/Canada. This is the same for 'Paris' where exists in France but also in Texas/US.
However, the geocoding component at least for Here service send only one answer if we send these name (London or Paris).
Is it possible to integrate this kind of situation ?
The Here geocoding service will indeed return only the most relevant result(s). It's currently only possible to filter results by country, but not to get all matches worldwide.
You can include the country name in your search query to retrieve results for a specific region.