Perhaps you should try some spelling variations:
history medical » history medieval, history media, history medicine
history mexican » history american, history mexico, history lexicon
lectures de » lectures _, lectures 1, lectures 2
lectura de » lectura del, lecture de, lecture des

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 de) OR (lectura de)) ((history mexican) OR (history medical)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((lectures de) or (lectura de)) ((history mexican) OR (history medical))".
• Adding a wildcard symbol may retrieve word variants: ((lectures de) or (lectura de)) ((history mexican) OR (history medical))*.