Hi,
When you visit
https://www.google.co.in , you can find the option to use
Google services in many Indian languages.
You can also do a Google account wide change through your account settings
to use your language interface across many Google services like Gmail and
Youtube.
Many Tamil Wikipedians have noted that Tamil Wikipedia articles are shown
at the top of the search results even when the keyword is in English.
This is not the case for every search but we guess that the quality of the
article, presence of the keyword in English at the beginning of the article
and accessing your language Wikipedia from an Indian IP address often can
contribute to this scenario.
When many users show trust in native language articles, the articles will
gain more trust in Google's view and it will start pushing for general
audience too.
Right now, lack of awareness of native language Wikipedias is an important
issue.
So, spreading this small trick :) may help to bring you more first time
visitors.
Ravi