Talvez debería tentar con algunhas variantes ortográficas:
"less constrained" » "qos constrained", "linear constrained", "models constrained"
plan constraints » island constraints, point constraints, flow constraints
plant relations » plant relationship, plant operations, client relations
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 relations))))"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("less constrained") OR ("((plan constraints) or (((plant chains) or (plant relations))))")).
• Removing quotes may allow a broader search: (( less constrained ) or ( ((plan constraints) or (((plant chains) or (plant relations)))) )).
• Adding a wildcard symbol may retrieve word variants: (("less constrained") or ("((plan constraints) or (((plant chains) or (plant relations))))"))*.