The best replacement for kru is ajarn.

The best alternatives to kru are rated as following:
★★★★★  ajarn
★★★★  4u2c
★★★  faizal tahir
★★  ram muay
★  faizal
★  linda rafar

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Speaking about kru, one probably shouldn't forget about adam.

Other search terms related to kru and their ratings are:
★★★★★ adam
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Google Trends

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kru
ajarn
4u2c