Repligo has a find function, from menu select more, find - a bar pops open at the top with arrows left - search back, right - search forward. A search for a specific word had results for me in less than 5 seconds, each tap on the arrow brought the next instance of the word up. It also reads bookmarks, whic you can easily add to your files with JPDF Bookmarks - http://flavianopetrocchi.blogspot.com/