Perhaps you should try some spelling variations:
"two-step sectoral method with accelerators" » "two-step sectional method with accelerators" (Expand Search), "two-step sector method with accelerators" (Expand Search), "two-step sectoral methods with accelerators" (Expand Search)
"two-step sectors method with accelerators" » "two-step sectors methods with accelerators" (Expand Search), "two-step sector method with accelerators" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("two-step sectoral method with accelerators") OR ("two-step sectors method with accelerators"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"two-step sectoral method with accelerators\") OR (\"two-step sectors method with accelerators\"))*".
• Removing quotes may allow a broader search: (( two-step sectoral method with accelerators ) OR ( two-step sectors method with accelerators ))*.