Perhaps you should try some spelling variations:
"1986 Philippine presidential detection" » "1986 Philippine presidencia detection", "1986 Philippine residencias detection", "1986 Philippine president detection"
"1986 Philippine presidential deteccion" » "1986 Philippine presidencia deteccion", "1986 Philippine residencias deteccion", "1986 Philippine president deteccion", "1986 Philippine presidential direccion"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"1986 Philippine presidential detection\") OR (\"1986 Philippine presidential deteccion\"))~".
• Removing quotes may allow a broader search: (( 1986 Philippine presidential detection ) OR ( 1986 Philippine presidential deteccion ))~.
• Adding a wildcard symbol may retrieve word variants: (("1986 Philippine presidential detection") OR ("1986 Philippine presidential deteccion"))*.