One of my site is about digital cameras, i am happy with the number of visitors/day, i have different titles, description and keywords on every page but i have some ads about furniture, doors, construction, medical on some pages, what can i do ? Should i change the keywords, add more content ( text ) to those pages ? Please Help
If you have not done so, install the Google Adsense Preview Tool as it will show you the different ads for different countries. It is possible that the relevant advertisers may not have target your country and thus those did not show. There is little much you can do apart from changing keywords and add more contents unless you opt for a more static ad system which allows you to pick and choose your ads.
You can always filter your unwanted ads with competitve filter, further give it sometime to show relevent advertisement if it's not over 48 hours.