But if you wanted to be seen under "red tennis shoes" all you would need to enter is "tennis shoes" as it does work in the other direction more yes less no.
But I always recommend to put as main terms even if they are similar into your account as you'll end up getting more impression and be able to better judge and track your ad spending.
For example I would list the following keywords:
tennis shoes
size 1 tennis shoes
size 2 tennis shoes
size 3 tennis shoes
size 4 tennis shoes
size 5 tennis shoes
ect....
blue tennis shoes
green tennis shoes
red tennis shoes
pink tennis shoes
white tennis shoes
ect...
nike tennis shoes
noname tennis shoes
my tennis shoes
where are my tennis shoes
ect...
this way you can see where you money is going and you can control it better, say you don't sell nike tennis shoes then I would add
-nike
this way I don't spend money on an user that I can't help.
Just to clarify, the negative AdGroup words simply have to get entered once within the keyword list to affect all the other keywords.
In other words,
"red tennis shoes"
"blue tennis shoes"
"green tennis shoes"
-nike
as a keyword list would exclude 'nike' regardless of the search on the other keywords. "nike blue tennis shoes should fail to trigger an ad from the above list, correct?
The AdWords documentation make that a little less than clear since it lacks an example list. The definition below, to me anyway, suggests that the -keyword must appear alongside all keywords in your list.
Negative keyword. Include a dash before your keyword: -red
If your keyword phrase is tennis shoes and your negative keyword is -red, your ad will not show if a user searches for red tennis shoes.
Thanks,
patient2all