How accurate is the availability on the RTW planner? Is there more availability if you call?

As part of my trip next summer, I'm looking for a DEL-PEK flight. I can't get anything on MU or CZ. I can't even get anything direct DEL-PVG/CAN. The only routing I'm finding is a surface sector to BOM then BOM-ICN-PEK on KE.

It's not blocking them completely, because when I do a PEK-JFK search, MU and CZ flights show up.