You can also search for words or phrases from within a document by using the Find button, located on the document toolbar:

You can then type in your search term and you will be presented with a list of hits within the document. Simply click on the corresponding page number or use the arrow buttons to navigate through the results. Hovering your mouse over the page number hits will give you a pop up with the result and a few lines of context either side:

All of the above searching techniques are reliant on the document being OCR’d correctly on Opus 2.