Why canĺt I see my own posts?

You may have accidentally hidden them. The funnel icon in the top right corner of the news feed vk.com/feed can help. Click on your name in the list and then click save.

Also, at the bottom of the menu to the right, you can check if you have the ôInteresting at the topö setting enabled. Try turning it off. This might bring all of your posts back to the news feed.
Your search for returned no results.
Try using other keywords, e.g.: "delete profile", "create chat".
Check your request for misprints.