Searching the Internet Effectively

I searched for information on computer memory. My results are below.

First Search - Simple Search
search memory
672,000,000 results in 0.32 seconds

Second Search - Use Additional Keywords
search computer memory
66,900,000 results in 0.22 seconds

Third Search - Use Phrases
"Searching upgrading computer memory"
608,000,000 results in 0.38 seconds

Fourth Search - RAM
"Searching upgrading computer memory and RAM"
1,160,000 results in 0.38 seconds