What are “Broad Match Modifiers”?
Ever since AdWords went to expanded broad match (that’s Google-speak for “we’ll show you ad if we feel it is within 100 miles of being relevant to a search”) advertisers have been adding using more phrase match, exact match and negative keywords to avoid less qualified impressions and clicks. Frankly, experts have been bitching about this since it was pushed system wide. Of the 13 Deadly Sins of PPC, I rank it #3. Broad match modifiers is Google’s response to all the complaints.
This visual should help explain, but basically you add a plus sign to let Google know which word(s) are required.
Basically, if you add a plus sign in front of every word you can revert to the basic broad match. While most most beginner/intermediate users will go this route, advanced users will continue to test and optimize to find the best combination. I hate on broad match plenty, but Google has a lot of data and may help you discover profitable keywords you might have missed.