Best buddy, Google.com

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After taking up my exams a few hours ago, I began searching about case studies on pipeline corrosion. My head was still spinning because of lack of sleep last night. I cannot find a way to start my search of the studies. I browsed Google and looked for the words 'a case study of corrosion in pipelines'. At first I thought my search will be fast but it turned out that it will not be. The subject is not easy to find so I tried using other keywords but I still missed my target. Until, I finally found it through the help of my buddy. How about you? Did you have an experience where you have been looking for something on the Internet but cannot find it because you don't know the correct keyword(s)? Share your experience to me about it. What did you do to be able to find it?