Perhaps you should try some spelling variations:
"the other fractures series" » "the other fracture series", "the other structures series", "the other fractures stress", "the other features series"
"the other lectures strings" » "the other lectures curing", "the other lectures during", "the other structures strings", "the other features strings", "the theory lectures strings", "the other creatures strings"
"the others lectures series" » "the other pictures series", "the theories lectures series", "the author's lectures series", "the others lecture series", "the others lectures suivies", "the others lectures scales"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("the others lectures series") OR ("the other lectures strings"))) OR ("the other fractures series")).
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• Adding a wildcard symbol may retrieve word variants: (((("the others lectures series") or ("the other lectures strings"))) or ("the other fractures series"))*.