In the example on the previous page, you found the document you wanted, together with other documents. But this cannot be guaranteed when using a single word as a search term. Consider the following example.

Suppose you wanted to find all the documents in a database dealing in any way with railway trains. You ask yourself: 'What words or phrases are likely to be used to express this key concept?'  You decide to do two searches, using the word 'train' and the phrase ' "railway trains" '. Note that when two or more words are put in double quotation marks, they will be treated as a phrase. If you omit the double quotation marks, the words will be treated as if they were separate words connected with the word 'and'.

Read the documents below and decide which of them would be found if you search with the word 'train' and the phrase ' "railway trains" '? Click on each document for comments.