Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified chemical solution algorithm" » "modified chemical evolution algorithm", "modified chemical convolution algorithms", "modified chemical evolutionary algorithm", "modified thermal solution algorithm", "modified chemical reduction algorithm", "modified chemical reaction algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified chemical solution algorithm\") OR (\"modified notion approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified chemical solution algorithm ) OR ( modified notion approximation algorithms ))~.
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