By default results are returned if any one of your keywords is found in the document.

All lower case keywords will search case insensitively. If an upper case character is included in a word then that word will be searched case sensitively.

Use quotation marks around phrases, put + (plus) in front of any word or phrase that is required, and − (minus) in front of a word or phrase to exclude it.

Examples:

• sydney "opera house"
• "opera house" −sydney +vienna