Search with boolean operators

The Boolean operator AND, OR, NOT can be added to re-fine your searching result when using Google Search.

AND(+): The AND operator forces Google to match the search results against all your keywords. The operator is signified by a plus sign (+). Place the plus sign immediately before any words without a space, for example: Google +search

NOT(-): The NOT operator excludes words. The symbol is a minus sign (-). Place the symbol immediately before a word.
for example: Google -search

OR: The OR operator is helpful when using obscure keywords that might not return much of value if used singly. It also neatly divides a search along two concurrent avenues of exploration. Simply type OR (use capital letters) before a keyword and leave a space between the operator and the following keyword. Google then accepts matches to the keyword preceding the operator or following the operator.
for example: Google Android Maps OR Earth