Perhaps you should try some spelling variations:
sectional studies » functional studies, regional studies, observational studies
doctoral studies » doctoral students, doctoral student, cultural studies
batka regional » bata regional, data regional, lanka regional
bank regional » lanka regional, mask regional, park regional
world batka » world back, world banks, world bank's

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