| () | 
								Use Parentheses to override operator precedence. The expression inside the parentheses is executed first. | 
							
							
								| blank | 
								Search for Articles containing both search keywords(expressions) between blanks | 
							
							
								| | | 
								Search for Articles containing one or more of the words linked by an | | 
							
							
								| ! | 
								Exclude Articles that contain search keyword after an ! | 
							
							
								| *str | 
								Search for Articles containing keywords ending in str | 
							
							
								| str* | 
								Search for Articles with keywords that begin with str | 
							
							
								| "" | 
								Search for Articles that exactly match the search keyword in " |