How many keywords can you use when hooking up to a search engine (SE) ?

[smitharetha]

Hello Friends,
Please Tell Me Some Information,
How many keywords can you use when hooking up to a search engine (SE) ?

[dennis123]

Most probably 4 to 5 keywords you can use to a search engine.

[arianagrand]

I have no idea about this, even if same question can be search on Google, their is no exactly result found.