You can use the Boolean operator NOT to ignore search results that include specific words:
Note: The search will not be executed if there are no words before the NOT operator. This can be circumvented by using the following formula:
(a*|e*|r*|t*|i*|s*|c*|o*|m*|l*|f*|d*) not [keyword to be ignored]
A minus symbol ("-") in front of the excluded keywords is also acceptable:
(a*|e*|r*|t*|i*|s*|c*|o*|m*|l*|f*|d*) -[keyword to be ignored]
Also check: Search using keywords