I just realized i didn't pick a good exemple i wanted something like
a keyword build out of 3 other keywords
k1 k2 k3 (as one keyword) and also searched
k1 k2 and
k2 k3 and if writting <b>k1 k2 k3</b> i shoot 3 rabbits
. For the rest of the text i choosed a good exemple for questions which bother me