The best replacement for tch is acth.

The best alternatives to tch are rated as following:
★★★★★  acth
★★★★  ch
★★★  ch spelling rule
★  ch rule
★  tsk
  comdata

Your alternative for tch is not listed? Suggest!
Speaking about tch, one probably shouldn't forget about perjeta.

Other search terms related to tch and their ratings are:
★★★★★ perjeta
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Google Trends

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tch
acth
ch