No, Vietnam is not further west than the prime meridian (zero degrees latitude).
Yes, Vietnam is further east than the prime meridian (zero degrees latitude). The midpoint of Vietnam is further east by approximately 6,988 miles (11,246km).
Yes, Vietnam is further north than the equator. The midpoint of Vietnam is further north by approximately 971 miles (1,563km).
No, Vietnam is not further south than the equator.