i mean e.g. i wish to search for "abcd" , "pqrs" & "wxyz" to know their popularity, i need to input 3 separate searches. And i'm looking for sites / ways to type in all 3 words to search for google results. But they are absolutely independent searches.
their popularity... uhm, you probably mean something like yahoo has (overture) suggestion tool which shows relevant keywords/searches within each month... well, google does not have anything like that.