Yes! Pulling out nutgrass by hand will not only not stop it from coming back but will make it worse. When you pull it out by hand you only remove the above-ground leaf material. The nuts and rhizomes remain below the surface. If you don't kill these the nutsedge will regrow in the same spot. So if you insist on removing this by hand you need to dig down and take all the tubers out.
Removing nutsedge by hand can worsen the problem as pulling it out stimulates dormant tubers to start growing. You can add onion grass and oxalis to the list of weeds you shouldn't pull out. For help in identifying weeds use our handy weed ID chart.