Perhaps you should try some spelling variations:
de instituto » del instituto (Expand Search), e instituto (Expand Search), des instituts (Expand Search)
do instituto » del instituto (Expand Search)
salud public » salud publica (Expand Search), salut publica (Expand Search), wales public (Expand Search)
public de » publica de (Expand Search), publica e (Expand Search)
boletin » bulletin (Expand Search)
chimie » chemie (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: boletin ((de instituto) OR (((do instituto) OR (_ institute)))) de salud public de chimie~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "boletin ((de instituto) OR (((do instituto) OR (_ institute)))) de salud public de chimie".
• Adding a wildcard symbol may retrieve word variants: boletin ((de instituto) OR (((do instituto) OR (_ institute)))) de salud public de chimie*.