Perhaps you should try some spelling variations:
produccion comparativa » produccion compartida (Expand Search)
utilidad comparativa » utilidad compartida (Expand Search)
continental shell » continental shelf (Expand Search)
shared production » sobre produccion (Expand Search)
"hoyos de dona" » "lodos de dona" (Expand Search), "modos de dona" (Expand Search), "hoyos de don" (Expand Search), "hoyos de donald" (Expand Search), "hoyos de donde" (Expand Search)
explotacion » exploracion (Expand Search), explicacion (Expand Search), exportacion (Expand Search)
conjunta, » conjunto, (Expand Search), conjuntos, (Expand Search)
"reforma energetica" » "reforma energeticoa" (Expand Search), "reforma energeticosa" (Expand Search), "reforma synergetica" (Expand Search), "reformasa energetica" (Expand Search)
energetic » energetico (Expand Search), energeticos (Expand Search), synergetic (Expand Search)
reform; » reformas; (Expand Search)
exploitation; » exploration; (Expand Search), explicacion; (Expand Search), exploracion; (Expand Search)
"donut holes" » "donat holes" (Expand Search), "donet holes" (Expand Search), "donut roles" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: reforma energetica ; plataforma continental; utilidad comparativa, produccion comparativa, explotacion conjunta, hoyos de dona ; energetic reform; continental shell; shared utility; shared production; joint exploitation; donut holes.