Apps Mail's advanced operators will help you make your search and filter criteria more specific. 

You can use one filter to manage messages from a number of different email addresses. For example, if you wanted to create a filter for all emails received from just math teachers or just one grade level of teachers, you could enter in the email addresses of those teachers into the filter. 

To create a filter for categorizing emails from select email addresses, follow these steps:

1. Click Create a filter at the top of any Gmail page.
2. Enter each email address in the From: field, separated by OR. Make sure to add parentheses around everything listed in the From: field. 
   
   
   
   
   
3. Enter all other message criteria in the appropriate fields, and click Next Step.
4. Check the box next to the action you'd like the messages to take.
5. Click Create Filter.

For example, to create a filter for messages from 'teacher1@myschool.org' and messages that contain the subject line 'Meeting Reminder,' you can enter 'from:teacher1@myschool.org OR subject:'meeting reminder' in the 'Has the words:' field.

To clarify your filter criteria with advanced operators, follow these steps:

1. Click 'Create a filter' at the top of any Gmail page.
2. Enter your filter criteria. In the 'Has the words:' field, you can use any advanced operators to filter messages meeting various criteria. Please note that the 'or' function in Gmail is represented by 'OR,' and the 'not' function is represented by a minus (-). You also can use quotes (" ") to specify an exact phrase.
3. Click 'Next Step' and select the action you'd like these messages to take.
4. Click 'Create Filter.'

To use advanced operators in your searches, click 'Show search options' to the right of the search field, and enter your search terms and advanced operators in the appropriate fields.

You can check out a list of Gmail's advanced operators here.

* Check out search as you have never seen it before. Gmail Theater presents an ensemble cast of engineers in The Isle of Lost Emails. Watch the video on YouTube. *