1st of all this is a very expensive build but u can do over 3000 dmg whit trynda whit all items.

Early game

Trynda is pretty weak untill lvl 6 so if ur against somone u think u cant kill just avoid combat. Once you reach lvl 6 ull probably have boots and lifesteal already, if u cant kill top lainer try ambushing whit ur team bottom line.

Mid game

Hopefully you have boots lifesteal and Phantom Dancer ( or close to phantom dancer ) ull keep ambushing but also jungle, the dragon is no problem to kill at lvl 9 if u have atleast zeal, atack speed boots and life steal.

Late game

Trynda is pretty easy to make money so ull probably only be missing 1 - 2 items ull be hitting over 1000 dmg atleast, altough if you have all items u will be hitting atleast 1500 or bit less but to hit atleast 3000 just use a skill like Spinning Slash and 1 hit them thx to black cleaver and runes ull have armor penetration u will be 1 shoting them :)

For those who never used trynda

Follow these steps. Also u must be cordinating ur skills like for exemple not using endlees rage at the start of a battle (unless u atack vs 3 and your the target) it will be a waste , hes a pretty good runned and chaser, by using Ghost + Spinning Dash ull get close to the champ or be able to run if u still cant kill him and you can use mocking shout do it but when u get close to him use exaust and he should be done.
Trynda is easy to play but hes not resistent at all so DO NOT go kill them in towers unless you have got endless rage or you have alot of health.

and this is it a simple build wich you can try it works for me, so it might work for you :D GL & HF :)