Currently there is no way to exclude multiple keywords from a search query using the "NOT LIKE" filter. Adding an OR group does not work due to the way searching works:
The "OR group", doesn't run both search criteria as it is set to run only one condition at a time. When it runs the first condition(Not Like *ABC*) it only look for document that doesn't contain "Test" in the description and shows those documents in the search results. This search result contains documents which has the keyword which is mentioned in second condition(which is yet to run).
Similarly, it runs the second condition, only looks for second condition(Not Like *XYZ*), shows the documents which doesn't contain "Topside".
This combinedly gives the search results that contains both the keywords.
Having an "AND group" function besides the "OR Group" would fix this, as the search then becomes "NOT LIKE *ABC* AND NOT LIKE *XYZ*" excluding both keywords.
(request comes forth out of issue case #CS0042603)