By concatenating words describing concepts I'd like to have together. For example:

• Foldable rechargeable lightweight flying exoskeleton
• Cheap quiet fan that fits in my window while moving as much air as possible
• Waterproof lightweight summer footwear
• Non-addictive method to instantly fall asleep
• Low sugar cheesecake
• Small and cheap dynamometric drill adapter adjustable for 0 to 500Nm

...and so on. Just use your imagination.