A brown bear is usually referred to simply as "karhu", but it can also be called a "ruskeakarhu", without the space and only one stressed syllable. "Ruskea karhu" with the space and two stressed syllables is any bear that happens to be brown.
The point here is that Duo does not accept the "searching" you are discussing; Duo incorrectly in my opinion only accepts "looking for."
Elsewhere I was taught that "etsiä" is "to search." Hence I reported it. (Jan. 2021)