Your word puzzle could need the spelled with/contains filter instead of letters. Searching for "the letters aeloprst" is not the same as words "spelled with aeloprst". You must say "spelled with" or "contains" in your word search. For large sets of characters to decode, use the unscrambler.
Page 1: personality, relationship, Australopithecus, blastopore, australopithecine, prepositional, oversimplification, polymerisation, semiautobiographical, stereotypical, depolarisation, compartmentalisation, hypocriticalness, perlustration, personalization, hypercholesterolemia, antipersonnel, depersonalization, depersonalisation, interpersonal, supportable, temporalis, nephroblastoma, philosophaster, insupportable, transposable, speculator, overcapitalisation, claustrophobe, pulverisation, problematicness, profitableness, philanthropies, oophorosalpingectomy, xenotransplantation, unprofitableness, unsportsmanlikeness, psychogalvanometer, saprolite, polyunsaturated, impressionability, dermatoglyphics, blepharoplasty, plasterboard, nephrolithiasis, personalty, patronless, thermoplastic, politicaster, and polycrystalline