Great addon, but maybe one further improvement? Rated 4 out of 5 stars

Thank you for this awesome addon!
But, if I first search some words with an engine (e.g., search and highlight "condensed"), it works perfectly; then I want to further highlight a phase (e.g.highlight "condensed into") which exists on the result webpage. How can I do this in the minibar?

*****
Thank you for your reply.
But at my first try, I did search exactly as what you have said - add words at the end of the first search terms and enter or click the sign of enter. But no change occur on the page.
I tried again today with google, duckduckgo, baidu and some Chinese web sites, failed again.
For instance, I search condensed in google, on the search result page there are terms of "condensed milk". Then, I input milk at the end of condensed in the mini bar, and ENTER or left click the button at the right end of the mini bar. No change.

*****
Thank you for your kindness!

This review is for a previous version of the add-on (6.6.1-signed). 

I just tried the same test with the word "condensed" alone, and then adding "milk" in the minibar, and you' re right: only the word "condensed" is highlighted in the Google search results. But if you click on the Wikipedia link, you will notice the expression "condensed milk" is properly highlighted. This is because Google decided to display the word "condensed" in bold, making the expression "condensed milk" spread across multiple nodes, which unfortunately falls in the limitation I talked about in my first answer.
Notice that this inconvenience occurs only in search engines and rarely in visited web pages. Of course, I am planning to get rid of that limitation.