I think Porifera, Cnidaria, Ctenophora, Platyhelminthes, Aschelminthes, Annelida, Arthropoda, Mollusca, Echinodermata, Hemichordata these are the ten major phyla I want to know which are those 20 minor phyla, of all thirty phylas....?????

Minor phyla are those groups of animals comprise of ill known and ill defined fewer  animals. Phyla are actually classified as major and minor phyla, on the basis of number of species they comprise of and their ecological importance.

Name of some minor phyla are as follows.
Nematmorpha, Priapulida, Kinorhyncha, Loricifera, Onychophora, Sipuncula, Phoronida, Nemertea, Entoprocta, Gastrotricha, Xenoterbellida, Acoelomorpha, Ctenophora, Enteropneusta, Pterobranchia, Placozoa, Choanoflagellata, Cycliophora, Gnathostomulida, Chaetognatha.