也许你应该尝试一些拼写变化:
informational instruments » international instruments, information instrumental, national instruments
information instruments » information instrumental, deformation instrument, information investments
control extensions » central extensions, central extension, control extending
extensions array » extensions delay, extensions read, extensions matrix
array paving » array planning, array imaging, array probing

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• Performing a fuzzy search may retrieve terms with similar spellings: ((information instruments) or (informational instruments)) control extensions array paving~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((information instruments) OR (informational instruments)) control extensions array paving.
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