According to a blacklist
Here you can specify a list of undesirable words or phrases. All keywords including them as fragments will be deleted. For example, you can blacklist "free download" or "official website" word combinations, or separate words, like "toy" for the special-purpose machinery topic. You can also use two special characters. "%" replaces any number of any other characters. For example by specifying "plast% wind%" you will delete all keywords that include "plastic windows", "plastic window", "plastic and wooden windows" word combinations. "_"replaces any single character. For example, the "plast__ windows" filter will include "plastic windows" and "plaster windows", but not "plastic and wooden windows".