Talvez debería tentar con algunhas variantes ortográficas:
plant relationship » plant relationships, patient relationship
"less constrained" » "qos constrained", "linear constrained", "models constrained"
plan constraints » island constraints, point constraints, flow constraints
plant chains » plant remains, plant against, plant toxins

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("less constrained") or ("((plan constraints) or (((plant chains) or (plant relationship))))"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("less constrained") OR ("((plan constraints) or (((plant chains) or (plant relationship))))")).
• Removing quotes may allow a broader search: (( less constrained ) or ( ((plan constraints) or (((plant chains) or (plant relationship)))) )).
• Adding a wildcard symbol may retrieve word variants: (("less constrained") or ("((plan constraints) or (((plant chains) or (plant relationship))))"))*.