anchor text for mutiply keyword.

if i wanna target 2 keyword "machine" and "time machine"(just sample not real case) , i use "machine - time machine" as anchor text for backlink . i think it is better than using single keyword as anchor text. you see, machine repeat 2 time in anchor text ,and i also target time machine in a link. am i right? what do you think?

 

I think its better to use Machine as one anchor and Time Machine as another.

 

I think "Time Machine" can give you emphasis on both keywords that you like to target.

 

Use both of them