It's because of the hyphen, which negates everything following it, so you're getting a list of every hoya with "D" and "S" in its name, I suspect. It's easier to go to the Hoya section of the database and look for the plant on the "D" page.
When I moved the photos, I used the plant ID# (131211) instead of typing in the name. Now that I've given you the plant ID#, you can just type 131211 into search and it will take you straight to Hoya 'DS-70.'
