You're doing it wrong. Get enough links that you are an authority. Then if you want to rank on a term, put up an article on that term. Don't use offpage factors to rank for specific terms, that's a recipe for your next thread on 'my rankings plummetted, what do I do?'.
Since Google gives you ranking consideration for the first eight words within your anchor text
Puleeze. Really? Anybody believe this is a 'known'? Not seven, not nine, no no, it's eight words?
And why on earth would anyone care at that level of granularity? That's a wasted effort spent on pure speculation.