The stamp on the left commemorates Malaysian 2016 Paralympic gold medal winners and I believe the stamp on the right is from a 2017 series that commemorates "Malaysia Day" (formation of the Malaysian federation in 1963). And the one in the middle is a low-value definitive. This one is from the "Agriculture and Fruits" series printed between 1986 and 2000. I believe there were different runs for each Malaysian state. So for this particular stamp, 5c cocoa, there would be several variants, each with a different state name, crest and leader.