Perhaps you should try some spelling variations:
block sparse » block store, block spaces, local sparse
block space » block spaces, bloch space, bloch spaces
black space » slack space, blank space, black spruce
blau space » blank space, blank spaces

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((blau space) OR (((black space) OR (((block space) OR (block sparse)))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((blau space) or (((black space) or (((block space) OR (block sparse))))))".
• Adding a wildcard symbol may retrieve word variants: ((blau space) or (((black space) or (((block space) OR (block sparse))))))*.