May want to keep google (or engine of choice) close by- tried initial search from their homepage for "DNA", too which is said:
We didn?t find any results for ?DNA?
Some reasons might be...
a typo. Please check your spelling.
your search includes a term that is very rare. Try to find a more common substitute.
too many search terms. Please try fewer terms.
Finally, try to think of different words to describe your search.
Tried this 6 times in a row with same results after which I waited 10 minutes and it finally started to return results.
Interesting- was I the first to search for "DNA" and it needed indexing?