Refine your search phrases on Google:

"your keyword + blog"
"your keyword + add comment"

Or you can simply use Google's blog search feature, can be seen on the left side panel of Google's search results pages.

For commentluv blogs, you can just use their custom search engine: The CommentLuv Plugin | version 2.9 (free) Coming Soon

For other methods you can check out my post about strategic link search here:
8 Ways To Do a Strategic Link Search | Kaiserthesage

its not a big deal, as you can simple enter blogsearch.google.com instead of google, there you can enter for whatever keyword phrase you were searching, you will be face with blogs result, hunt for you interest then...

regards

actually, you can also go to Technoratti and then look over the categories. This is much better since the blogs in Technoratti are much more genuine and most of them are updated regularly, so if you can get an active blog, provide good comments, bookmark it, and keep on commenting when they update new posts. This wya you don't have to keep finding new blogs to comment on and still keep your backlinks strong.

Keyword:"blog"
"keyword"+"blog"
region blog "keyword"

Keyword:"blog" that command is not working..I want some other tips

You need to get a footprint. If you want to extract the results, you need something like scrapebox.

distilled.co.uk/blog/seo/finding-link-opportunities-with-advanced-search-queries

That's a great article on finding link opportunities through search queries on Google.

Very simple use this command
"keyword+blogspot+wordpress+comment"
or
use can use search engine option in more after search on left.