Perhaps you should try some spelling variations:
"butyrates chemistry topics" » "butanes chemistry topics", "borates chemistry topics", "citrates chemistry topics", "butyrates chemistry optics", "butyrates chemistry basics", "butyrates chemistry tools"
"glutaral chemistry trends" » "neutral chemistry trends", "glutamates chemistry trends", "global chemistry trends", "glutaral chemistry theory"
"nitrates chemistry topics" » "nitriles chemistry topics", "nitrogen chemistry topics", "borates chemistry topics", "nitrates chemistry optics", "nitrates chemistry basics", "nitrates chemistry tools"
"general chemistry terms" » "general chemistry tools", "general chemistry types", "general chemistry towards"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("glutaral chemistry trends") OR ((((("butyrates chemistry topics") OR ("nitrates chemistry topics"))) OR ("general chemistry terms")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"glutaral chemistry trends\") or (((((\"butyrates chemistry topics\") OR (\"nitrates chemistry topics\"))) or (\"general chemistry terms\"))))".
• Removing quotes may allow a broader search: (( glutaral chemistry trends ) or ((((( butyrates chemistry topics ) OR ( nitrates chemistry topics ))) or ( general chemistry terms )))).
• Adding a wildcard symbol may retrieve word variants: (("glutaral chemistry trends") or ((((("butyrates chemistry topics") OR ("nitrates chemistry topics"))) or ("general chemistry terms"))))*.