頭がどうかしている

あたまがどうかしている

to be crazy, to be mad, to have a screw loose

どうかしている

something wrong with (someone), not oneself, crazy, nuts

どうにかして

by any means (possible), somehow

どうしてる

How did you like...?, How about...?, What's going on?, How's it going?

どうかしら

I don't know..., How about...? I wonder, What about..?

どうか

please, somehow or other

かどうか

whether or not (in phrases like "I don't know whether or not I can come")

どう致しまして

どういたしまして

you are welcome, don't mention it, not at all, my pleasure

どうしたって

by all means, no matter what, at any rate

どかどか

noisily, with loud footsteps

どうかしたのか

どうかしたのですか どうかしたんですか

is something up?, is something wrong?

どうか宜しく

どうかよろしく

please remember me; please help me; please treat me well; I look forward to working with you

どうした訳か

どうしたわけか

somehow; for some reason (or other)

どうにか

in some way or other, one way or another

どうかな

how about...?

どしどし

rapidly, constantly, one after the other, without hesitation, sound of tramping

どうしたものか

what is to be done?; what should (I) do?; what (am I) to do?

どうやって

how, in what way, by what means