dissappear

Hi, i have website on expired domain i was make some linkbuilding, and its start showing on some kws in google, and then site disappear from kw serp. I should make stronger backlinks to stabilize it? And i see some strange thing example: Keyword - not showing keyword1 - not showing keyword3-...

Hi Guys, I have this cpa site i'm ranking, it has been on google since the past 2- 3 months. but lately it just dissappered from google(usa) but it still shows in my country google. it appears once in a while in the usa google but the last time i saw it there was 3 days ago. but this was not...