Is there a way to screen out companies with "China" in the company name?

You could do an advanced screen with:

companyname NOT LIKE "%China%"

However, that is suboptimal for filtering out Chinese companies. A better way to do that would be to use a basic screen for:

Country Located In != "China"

You can do that by going to Add Condition->Descriptive->Company->Country Located In and then selecting "!=" and "China" from the drop down menus in the dialog that appears.