We've introduced a new search feature during our last site update (the one with the UI change (2 columns each row instead of only 1 column).
Registered and logged in users can now search for "C#" or similar 2 characters long terms.
Please use the "advanced search" for this.
Enter your short term in the field "Wildcard" and start your search.
In addition you can now search for terms beginning with a few characters link searching for "finan".
This will find words beginning with "finan" like "Finance", "Financial" or "Financially".