What did Boaz tell his young men to do so that Ruth could gather more grain?

Answer: Pull out stalks for her to glean

Boaz ordered them to pull out stalks from the bundles and leave them for her to gather, and not to rebuke her.

“When Ruth got up to glean, Boaz ordered his young men, “Even if she gathers among the sheaves, do not insult her. Rather, pull out for her some stalks from the bundles and leave them for her to gather. Do not rebuke her.””— Ruth 2:15-16 (BSB)