''ma fahmen 3a halo'' means he doesn't understand himself... As an advice do not learn the slang Arabic..

Ma fahman 3a halo cho 3am ya3mel means he doesn't understand himself.. or he doesn't know what is he doing.. Wlek ba3ed 3ende 4 chapters means i still have 4 chapters to do

the meaning of the first sentence is that he doesnt know what he is doing the second means: keep far for me (dont disturb me) I still have four chapters

على حاله = himself