Academic searching is different to everyday searching. Often what we search for in our personal lives has a known answer, whereas with academic searching the questions are complex and do not have a simple answer.
Academic searching is an iterative process. We identify the concepts/themes of our research topic, then think of keywords to search for information on these concepts/themes. As we carry out searches, we alter the keywords we have identified depending upon the results returned. Then we re-search, all the time combining and analysing information using multiple sources.
Searching and finalising keywords/search strings is an iterative process that takes a lot of time.