Myriofyto is one of the villages at Ganohora! It was one of the two largest villages of the southern Ganohora. It is now called Murefte. You can find it here: http://g.co/maps/jpw9ghttp://g.co/maps/jpw9g.
After the exchange of populations, most people from Myriofyto went to the city of Kavala where they were farmers and most of them specializing at tobacco. There were others who went to Thessaloniki and from there some left and went to Nea Potidaia at Chalkidiki where they created a suburb called Neo Myriofyto (It means new Myriofyto). After 1929, when the processing of tobacco changed, there were a lot of people left without jobs at Kavala so they moved near the city of Kilkis and created a new village called Neo Myriofyto. You can find it between Doirani and Mouries.
About the names you told me, I have good news for one of them. I have heard from my grandmother that there was a family called Kambas at a city near Thessaloniki called Malgara. Unfortunately, my grandmother is dead so I don't have more information. There were people from Ganohora who went to Malgara, but as far as I know not directly from Myriofyto. However, it is very possible that after going to Thessaloniki they moved to Malgara. Ganohora were small villages, very close together, so they may had friends or family who went to Malgara.
Furthermore, I have searched at a list of various people from Ganohora, priests, teachers, businessmen, etc and I found a close match. There was a Zambas from Peristasi (now called Sarkoy) which was the second largest village at the southern Ganohora. He was a greek literature professor, specializing in Homer. He studied at a college named 'Zarifeia Didaskalia' at a city called 'Filippoupoli' and at the university of Athens. He was a teacher at the mens college at the city 'Andrianoupoli' during the years 1892-1894 and he taught Greek and German at private lessons. He was also the publisher of a magazine called 'To fws' (the light).
I would first try the Kampas family from Malgara. At the greek whitepages (http://www.whitepages.gr/en/) you can enter 'KAMPAS' as the surname and then select the option 'Thessaloniki'. At the second page you will find the result from 'NEA MALGARA'. There are also three people names Kampas at Kavala (at the search page at perfecture select Kavala). I couldn't find any Sivrikos at Thessaloniki, Kavala of Kilkis. I would not advise you to search for Paraskevi since it is a very common first name. Also, judging by the name Zafeiriou Paraskevi, I believe that Paraskevi is the first name and Zafeiriou is the surname. However, Zafeiris is another greek name, so if you are not sure it may be Paraskevi Zafeiriou meaning the woman named Paraskevi whose father is named Zafeiris. It may not contain a surname at all. Zafeiris is not very common at Greece, but it was at eastern Thrace.
I hope I could help. You can contact me by email too if you want.