Currently, I have one menu item (alias: parent) point to Parent category (alias: parent).
And when I click on the menu item, I see the items in there. My items have links like:
www.mywebsite.com/parent/item-title

I want to remove the category/menu alias from the URL. Any idea can help? :)

By the way, although I force to use special character for alias (in K2 advanced settings), sometimes I see the "Đ" is translated into "dh" in the aliases. Any thing I can fix it?

Thank you...

You have to use either K2's advanced SEF or an SEO/SEF extension which supports K2.

The advanced SEF options are located under K2's parameters