Perhaps you should try some spelling variations:
lectures field » lectures held, measures field, lectures food
lectures diel » lectures data, lectures dans, lectures dark
lectures de » lectures _, lectures 1, lectures 2
lecture de » lecture _, lecture 1, lecture 2

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((((lectures field) OR (lectures diel))) OR (lectures de))) OR (lecture de)) historia (mexicana* OR americana*).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((lectures field) OR (lectures diel))) or (lectures de))) or (lecture de)) historia (mexicana* or americana*)".
• Adding a wildcard symbol may retrieve word variants: ((((((lectures field) OR (lectures diel))) or (lectures de))) or (lecture de)) historia (mexicana* or americana*)*.