as the title says, i can struggle, and sometimes win against other armies,(i'm somewhat n00bish player) but tyranids always

me up...
here is my 1750 list
HQ-helbrecht
Terminator chaplain, eternal warrior storm bolter
Emperor's Champion(AACNMTO vow)
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TROOPS: 15 man crusader squad 10 initiates with 1 power axe, 1 flamer pistol+
CCW, 5 neophytes with pistol+
CCW
10 man crusader squad( 5 initiates 5 neophytes 1 power axe, 1 flamer, pistol +
CCW)
10 man' fire support' crusader squad(8 bolters, Missile launcher, plasma gun)
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ELITES
7 Close combat terminators (2 thunder hammer+ storm shield, 5
LC, furious charge, which i deploy so they join to chaplain and drive in
LRC)
Venerable Dreadnought with Assault Cannon and Heavy flamer(extra armor searchlight, smoke)
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HEAVY SUPPORT
2 Vindicators(extra armor,
PotMS)
Land raider Cruasder
I would kindly ask that some pro
BT player to give me some anti- nid strategy and tips
TNX