Why It Is Hard to Get indexed in Google??

Hi Friends,

One of my client's website have more than 44 lakhs webpages in which only 3.5 lakhs web-pages are indexed in google. I tried to submit 660 category based site but still index pages are increasing very slowly. Can any one suggest me how do i can get maximum pages index in google in small time span.

I need to get index maximum pages very soon.


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