What you type	Documents will be listed if they contain:
natural resources natural and resources natural <and> resources	The two words natural and resources, regardless of capitalization.
"natural resources"	The words natural resources together in that order, regardless of capitalization.
natural or resources natural <or> resources	Either the word natural or the word resources anywhere in the document, including together, regardless of capitalization.
"natural resources" Canada	Documents containing both the phrase natural resources and the word Canada.