Use the and connector to find words that are far apart from one another or in different sections. Searches using and usually find more documents than searches using the near connector. As a general rule, use and when it doesn't matter where your search words appear in a document. Use the near connector when there is a connection between your search terms and you need to find the terms near each other.
For example, to find general information about budget deficits, you could use this search:
budget and deficit
However, to find documents that are relevant when your search terms are less specific, you may need to use the near connector. For example, the following search will find more relevant documents than if the and connector were used:
fiduciary near/1 duty near/10 breach