Perhaps you should try some spelling variations:
transformation series » transition series
transformation subtle » transformation scale, transformation sociale, transformation survive
rural transformation » social transformation, structural transformation, digital transformation
pay rural » why rural
post des » post deng
post de » post deng

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( pay rural transformation subtle ) or ( ((post des) or (post de)) transformation series ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( pay rural transformation subtle ) OR ( ((post des) OR (post de)) transformation series )).
• Adding a wildcard symbol may retrieve word variants: (( pay rural transformation subtle ) or ( ((post des) or (post de)) transformation series ))*.