Perhaps you should try some spelling variations:
sectional studies » functional studies, regional studies, sectional study
doctoral studies » doctoral students, doctoral student, cultural studies
lanea regional » lanka regional, planes regional, area regional
mask regional » mask region, park regional, risk regional
world lanea » world linear, world line, world lines
world mask » world mark, world mass, world task

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: (( world lanea regional AND sectional studies ) OR ( world mask regional AND doctoral studies )).
• Adding a wildcard symbol may retrieve word variants: (( world lanea regional and sectional studies ) or ( world mask regional and doctoral studies ))*.