When I speak to "resource," I am talking about the military resource, and the reclamation resource..Philippines is actually much richer than Vietnam in both absolute and per capita terms. So one has to wonder why they can't come up with the same resources.
One look at the differences in the two militaries...and precisely what they are doing in the SCS makes that point.
As to why? There could be many reasons.
Vietnam, for whatever reason, is putting in place a much stronger military capability than the Philippines. And there reclamation efforts...although completely dwarfed by the PRC, are still significantly more involved than the Philippines.
The big news for Vietnam is actual reclamation efforts they are making on one of their islands. The big news for the Philippines is their desire to make an older, damaged and beached vessel on a reef more habitable for a few military personnel inhabiting it.