By structuring your search query correctly you can more accurately locate the information you want
Some search engines require you type the Boolean operators in upper case, so it is wise to always adhere to this convention.
If you use more than one operator in a search query, you can ensure the search engine analyses your query in the order you want by surrounding terms with parentheses.
Example 1: (red AND green) OR (blue AND yellow)
Example 2: pets AND (dogs OR cats)
In the real world we will also want to include phrases in our searches. In most cases this is accomplished by surrounding the phrase with quotation marks.
Example 1: "World Health Organisation"
Example 2: "World Health Organisation" OR WHO
Example 3: "South Australia" AND wine
Example 4: frogs AND NOT "spotted frogs"
You can restrict your searches to a particular country by doing field searches. Field searches look for the terms you specify in particular parts of a Web document. Valid field search terms differ from engine to engine. Some do not recognise them at all.
Example: If you want to restrict searches to Australian .au sites - you could try adding AND host:au to your search query.