Maximize the Use of Google Search Engine

Even though this blog is about free software, search engine that we can use as much as we want with no need to spend money is still categorized under this blog's topic. The definition about free software that I hold for this blog is anything that works under an operating system that has ability to perform some functions and can be used freely.

Sample Case: Find a Computer Science Book
Google search query: intitle:index.of "parent directory" computer science .pdf