About Boolean operators and special characters
Boolean searches with special character search terms result in invalid searches. For example, if you enter the following:
Related information
cloud OR +
The special character + is dropped. The effect is a Boolean search with no second term, which is an invalid search.
Here is another example:
cloud AND - AND computing
The special character " - " is dropped. The effect is a Boolean search with two adjacent AND operators, which is an invalid search.