why didn't this movie nominate for OSCAR from India?

What is really missing in this movie to get selected for OSCAR from India?
FROM WIKI: Vazhakku Enn 18/9 recevied high critical acclaim upon release. The Times of India gave it 4.5 out of 5, the highest rating ever for a Tamil film since its inception in April 2008, with its reviewer M. Suganth calling the film a "bravura piece of filmmaking that will leave you stunned - and even invigorated - by the time it ends".[21] Rediff's Pavithra Srinivasan gave the film 3.5 out of 5, citing that Vazhakku En 18/9 was "hard-hitting" and a "must-watch".[22] Sify's critic labelled the film as "excellent" and commented that it was "refreshing, captivating and engrossing".[23] Rohit Ramachandran of Nowrunning.com rated it 3.5/5 stating that Vazhakku Enn 18/9 was a "rewarding piece of cinema that establishes Balaji Sakthivel as a film-maker to look out for".[24] Malathi Rangarajan from The Hindu wrote: "The acumen of the ace story teller comes to the fore yet again in Vazhakku Enn: 18/9. A neat presentation with an all new-cast could have been a tough proposition. But Sakthivel achieves it with élan", concluding that the film was "another product Sakthivel can be proud of".[25] Indiaglitz.com noted that it had "moments that leave a lump in your throat", further citing that it "needs a man with conviction like Balaji Shakthivel to come up with such a convincing film", while calling it a "splendid show".[26][27]
Vivek Ramz of in.com rated the film 4/5 calling it "a rare film in Tamil Cinema" and added that it was one of the "gems with no star cast to boast off but definitely has a heart to give hope".[28] Romal M. Singh from Daily News & Analysis wrote: "Simply put, Vazhakku Enn 18/9 is the much-sought after cinematic ‘voice’, representing the world we live in — as is — no glamourising, no touch-ups and definitely no un-needed glorifying".[29] Ananda Vikatan hailed the film as "Pride of Tamil Cinema" and rated it a whopping 55 on 100.[30] Vishnupriya Bhandaram of The Hindu in her review of the Telugu version Premalo Padithe said: "What is perhaps beautiful about the story is that it is an amalgamation of two levels in society — the high, mighty and rich and the poor". She further continued: "With a heavy heart and a mind ridden with hard truths, take away what you can: a semblance of love in a promise to wait a lifetime for a half-burnt face".