Unless theres some sort of patch I'm afraid you are probably dreaming.
With laptops the graphics you get are what you stuck with.
Now you can assign more memory to the graphics with most laptops in the BIOS but whether that will help in any way I don't know but rather doubt it.
I don't know the Homeworld game and perhaps theres patches for it but it really depends on whether this game demands quite a lot of graphics power, if it does and your laptop can't supply it you are stuck. You may even find that the graphics on your laptop is not supported and unless theres a patch to address this you've had it.
Check the game site initially and see if theres any help there, particularly if theres a dedicated Forum.