Ten Bizarre Key Combinations in Word 2013
Shift+F4 — Repeat Find
Older versions of Word featured special buttons on the bottom of the vertical scrollbar. You can use them to find text, up or down. Those buttons were removed in Word 2013, so all that's left is the Shift+F4 keyboard shortcut, Repeat Find.
After you find a chunk of text and you’ve closed the Find dialog box or that Navigation pane thing, press Shift+F4 to find the next matching chunk of text in your document.