If you mean 'what are the strategies formulated by Ralph's oppostion to get Ralph out of the thicket' then there were two strategies. Jack first had a boulder from the top of castle rock sent crashing into the thicket with the intention of either killing Ralph or driving him out of hiding. When this failed Jack then lit a fire, hoping to smoke Ralph out of the thicket.
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A thicket is simply a dense and impenetrable patch of bushes or shrubs.
He backs away
Jack builds a thicket to keep away trespassers.
From their voices Ralph identified that Jack, Roger and at least one of the twins were outside the thicket, as he heard Roger and Jack question either Sam or Eric, to confirm that the thicket was Ralph's intended hiding place.
Once Jack is certain that Ralph is hiding in the thicket he puts two different plans into effect. Firstly a boulder is levered from the top of castle rock and sent crashing into the thicket. When this fails to kill Ralph or drive him out of hiding Jack puts his second plan into effect. He lights a fire, hoping to smoke Ralph out of hiding, and unintentionally sets the entire island on fire.