You can narrow your search results by excluding words with the NOT
syntax.
Single terms, phrases, and so on can be combined using "NOT" in upper, lower, or mixed case, or prefixed with "!" or "-".
These queries search for nodes that contain the terms yellow in any content.
yellow NOT banana yellow !banana yellow -banana NOT yellow banana -yellow banana !yellow banana
The NOT operator can only be used for string keywords; it doesn't work for numerals or dates.
Prefixing any search qualifier with a - excludes all results that are matched by that qualifier.