In the bing webmaster tool when I check my website's details I can see some page indexed position for some keywords. but when I search those keyword using bing search, those pages are not in the search results page, What is happening? Any suggestion?
The rankings do tend to vary depending on the country of the search and webmaster tool gives average position.
Indexing and showing up in search pages are 2 different things. I believe that search database is not updated quite often as index database. Its like 2 different "processes". When search database will be updated, then your URL will start showing up there too.