which means I cannot find only “flickr” results
Well, it’s not really a bug, it’s called fuzzy search. It uses a regular expression of some sort to search for matching titles. hence /[flickr]/ matches flicker, you will also receive results for flicker.
Yes, I understand that is what is happening.
For me, it is a bug. I search for X. It shows results for Y. Broken.
In technical terms a bug is when an unexpected behaviour occurs. Hence this isn’t an unexpected behaviour it’s not a bug, rather an annoyance.
However, can you try to search more specific for something?