phpBB comes with several predefined searches to easily perform certain types of queries.
View your posts - Returns a list of topics that you have posted in, sorted by the time of the last post in the topic.
View unanswered posts - Returns all posts which contain no replies.
View unread posts - Returns a list of topics containing posts which you have yet to read.
View new posts - Returns a list of topics containing posts which have been made since the last time you logged in.
View active topics - Returns a list of topics which have been posted in during the last few days. The number of days can be changed after loading the search page.
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