Perhaps you should try some spelling variations:
advanced countries » advanced course, advanced queries
advanced courses » advanced course, advanced cases, advanced nurse
advanced classes » advanced class, advanced cases, advanced case
from barcelona » fc barcelona, von barcelona, book barcelona

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: ((((advanced courses) OR (advanced classes))) OR (((advanced countries) OR (advanced control)))) in mathematics - from barcelona.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((advanced courses) or (advanced classes))) or (((advanced countries) OR (advanced control)))) in mathematics - from barcelona".
• Adding a wildcard symbol may retrieve word variants: ((((advanced courses) or (advanced classes))) or (((advanced countries) OR (advanced control)))) in mathematics - from barcelona*.