Database Building Block Worldcat

I tried using the building block search again with World Cat. I know I had 4 searches but I needed the practice on using building block.

S1 technology or computer > 2million hits

S2 help or assistance >735,000 hits

S3 (kw: help or kw: assistance) and (kw: technology or kw: computer) >42,000 hits

S4 (kw: help or kw: assistance) and (kw: technology or kw: computer) and libraries, limited to English and the years 2005-2008 and only chose books.

I still had 64 hits even with the limits.