Using quotation marks for phrase searching will help to ensure that the results you get back in a search engine are accurate.
When you search for a phrase like corporate social responsibility the search engine will bring back any results that have those words in them. However, if you put quotation marks around the phrase, "corporate social responsibility", the search engine will only bring back results that have all those words in them exactly in the order you have them printed. This can also be useful when you're searching for the title of a book or other resource.
As with any search strategy, you may want to consider what quotation marks are most useful for and anything you should be cautious about when using this searching technique:
The library has several books and ebooks in our collection which can help answer your questions about phrase searching. Check out the books and web resources listed in the FAQ How can I use quotation marks for phrase searching? for additional information.