To be sure if you deal with TYLCV, take some leaf samples (packed in a zip back) and contact the local pest control. Not sure how well organized it's in the Philippines though, - here in Thailand I am lucky to have got an office next door.
They can tell you A. if your plants truly are (have been) infected with TYLCV and B. if those as resistant claimed varieties really are "resistant", as told by the dealer or claimed by the manufacturer. In case you actually deal with TYLCV, it has most probably been brought in by carrier bugs (as explained earlier). Always closely watch you plants and check them for those spider mites and white flies, they may transmit other stuff as well!
Cheers and good luck,
Luches
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