Perhaps you should try some spelling variations:
"the layer structures strings" » "the layer structures strength", "the layer structures during", "the layer structures shaking", "the layer structure strings", "the layered structures strings", "the linear structures strings"
"the theories lectures series" » "the theory lectures series", "the theory lecture series", "the theoretical lectures series", "the theories lecture series", "the theories fractures series", "the theories lectures strings"
"the others fractures stress" » "the other fractures stress", "the other fracture stress", "the stress fractures stress", "the others fracture stress", "the others fractures surgery"

Try widening your search to All Fields.

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: (("the theories lectures series") OR ((("the layer structures strings") OR ("the others fractures stress")))).
• Removing quotes may allow a broader search: (( the theories lectures series ) or ((( the layer structures strings ) or ( the others fractures stress )))).
• Adding a wildcard symbol may retrieve word variants: (("the theories lectures series") or ((("the layer structures strings") or ("the others fractures stress"))))*.