Enter a keyword set in a page's SearchKeywords box to get matching set of photos. For example:
Enter "trench" to get all photos showing a trench.
Enter "Ann+Arbor" to get all photos in Ann Arbor.
Enter "trench-Ann+Arbor" (or "Ann+Arbor-trench" to get photos of trench in Ann Arbor.
Enter "backhoe-trench-Ann+Arbor" (or backhoe-Ann+Arbor-trench or Ann+Arbor-trench-backhoe, etc) to get photos of backhoe and trench in Ann Arbor.
From Keyword Guide