Since "aller chercher" means "to pick [someone] up" doesn't "Vas-tu les chercher ?" mean "Are you picking them up"?
Good point. I added some variants. Though at first glance, with no context, I'd translate as "look for them".
"Are you going to pick them up" is an accepted answer, but it can also mean "Are you picking them up" like Dennis said.
"Chercher" doesn't mean "to find"?
No. It means "to look for". "Trouver" is "to find". You must look for something before you find it.
Merci beaucoup pour votre aide !
If you're familiar with the phrase "cherchez la femme" then it's easier to remember that "chercher" only requires a direct object. Chercher + la femme.
It helps me anyway.