Perhaps you should try some spelling variations:
"Improving poor performance series." » "Improving poor performance metrics.", "Improving poor performance reviews.", "Improving poor performance review.", "Improving export performance series.", "Improving _ performance series.", "Improving firm performance series."
"Improving sector performance series." » "Improving sector performance metrics.", "Improving sector performance reviews.", "Improving sector performance review.", "Improving export performance series."
improving sector » improve sector, improving teacher, improving weather
improving poor » improving power, improving food, improving indoor

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