"Osama Bin Laden" and "Katrina Kaif" are the 2 most search keywords in Pakistan but they are not profitable. Earning money from Adsense doesn't means you have to write on a Topic related to Pakistan just because you live in Pakistan. You can choose any topic and write. People from around the world will read your articles if they are really useful and original. Look into your own qualification, interest and knowledge and then select your topic. Do some search on Google on your topic. If you see lots of Ads on the search result on the right hand side, you are there. Choose this topic. Khuda Hafiz!