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 ?