Hello,
Advanced (and Premium) licenses includes the searchAndHighlight method to search and highlight strings (strings that don't use template symbols so they can't be replaced using template methods). Maybe it's enough for your needs.
Premium licenses include DOCXCustomizer to change styles on-the-fly, but the content to be changed must be queried as XML element, so it may not work for all your contents (because maybe they can't be queried standalone).
If you upgrade your license to Premium, we also recommend you include LUS with the upgrade, the dev team can send to your email a new searchAndColor method to search and color strings (as searchAndHighlight does now but applying a text color).
Regards.