Efallai y cewch fwy o ganlyniadau drwy addasu'ch ymholiad chwilio.

• Gallai tynnu'r dyfynodau ganiatáu chwiliad ehangach: declaration of the united nations conference on the ((human environment) OR (built environment)).

Efallai y dylech gynnig rhai amrywiadau sillafu:
"declaration of the united nations conference on the human environment OR built environment " » "declaration of the united national conference on the human environment OR built environment " (Ehangu'r Chwiliad)