I just did a google search for vaginismus ( a condition in which a woman finds sex painful because of an involuntary spasm of the muscles surrounding the vagina).
I was very impressed when google offered me the following additional search options to fine-tune my search :
" Refine results for vaginismus:
Treatment Tests/diagnosis For patients From medical authorities Symptoms Causes/risk factors For health professionals Alternative medicine"

I guess google figured out that I was looking for information on a medical topic; and was offering customised results, based on my needs.

However, when I tried a search on
in vitro fertilisation, these additional options for "refine results" did not come up. Does anyone know what's happening ?