Perhaps you should try some spelling variations:
"different equations numerical simulations." » "different equations numerical simulation.", "differential equations numerical simulations.", "difference equation numerical simulations.", "differential equation numerical simulations.", "different excitation numerical simulations."
"different equations numerical solutions." » "differential equations numerical solutions.", "difference equation numerical solutions.", "differential equation numerical solutions.", "different excitation numerical solutions.", "different equations numerical simulation.", "different equations analytical solutions."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("different equations numerical solutions.") OR ("different equations numerical simulations."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"different equations numerical solutions.\") OR (\"different equations numerical simulations.\"))".
• Removing quotes may allow a broader search: (( different equations numerical solutions. ) OR ( different equations numerical simulations. )).
• Adding a wildcard symbol may retrieve word variants: (("different equations numerical solutions.") OR ("different equations numerical simulations."))*.