are vmc maneuver and circling approach the same thing ? if not then why ?
"vmc maneuver" as you write it is not a standard phrase and might be interpreted as a "maneuver" in Visual Meteorological Conditions. "Visual Manoeuvring (Circling)" is the standard ICAO phrase used for what is commonly called a "circling approach". Unfortunately, it is sometimes abbreviated to VM(C) which leads to confusion with Visual Meteorological Conditions.