andso   
dia
probably the same as dia: step, and used originally to indicate the next step in the narrative, etc. and, and so, then, even, in the next place. It is used to complete phrases, as: Ary nataoko, dia vita izy (And I did it, and so it was completed) [1.2]
It is often preceded by ka, as: Natsoinao aho, ka dia tonga (You called, me and so I have come) [1.2]
ka
that, so that, and so; but, therefore. It is often followed by "dia". In the provinces, it is often "ko": Nantsoiny ka tonga aho (Called by him, and so I am come) ~ Nanantena anao ho tonga aho, ka tsy tonga hianao (I hoped you woud come, but you did not come ~ Nokapohinao ka kaody izy (Flogged by you, and therefore he is shy) [1.2]
and so; used when what follows is an immediate consequence, as: Nianjera izy ka folaka ny sandriny (He fell and broke his arm) [1.7]