search what was introduced and not try to fit it into the most popular search
I could not find easily how to change language of Yahoo Maps, and I tried to search it on Yahoo:
"yahoo maps" change language
The first result that I get is:
How do I change the language of Google Maps? |...
It's totally crazy!!!!!!
Also several other map-regarding results refer to Google!
So, with the help of Yahoo search I cannot find things related to Yahoo products - very disappointing result.
However, the solution is rather simple: do not invent the things, search words that were introduced. Point.
But this defect exists also on Google or Bing. The algorithm consider itself be more clever than you, and as a result may offer (ant not very rarely) results that have nothing to do with your original request.
P.S. I appreciate your maps because they have sharply drawn railways, and in general more contrast and clear lines compared to Google, but now I have to refer to Google, as I cannot find suitable language.