Why my Google AS application was rejected

i am reading many threads complaining that they have good 6 month old domain, original content getting some good traffic but Google rejected there application for AS.

you must know that you need to have older then 6 month domain/web site if you are from India or China they are limiting aged domain only for these two countries.
the major factor that your application is rejected is that you have keyword "earn online" and some other keywords having same meanings.
you can put you AS code related to that keyword/niche "earn online" it ll not be problem they will not put red flag due to that niche but the only issue is they will not approve you if you provide the domain having "earn money" keyword can be domain or keyword in content.
for Asian countries they approve if you apply using a third party services like hubpages and blogger