Perhaps you should try some spelling variations:
"technology conversion periodicals." » "technology conservation periodicals.", "technology cooperation periodicals.", "technology construction periodicals.", "technology conclusion periodicals.", "technology connection periodicals.", "technology converging periodicals."
"technology convention periodicals." » "technology conventions periodicals.", "technology prevention periodicals.", "technology condition periodicals.", "technology connection periodicals.", "technology competition periodicals.", "technology consumption periodicals."

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