Item and champion search abberviation

there are many items and champions on the forums that you can type in the names of in order to find faster. however some of them dont have thier normal abbrevation work becuase its not how they are spelled

for example if you type in "TF" wont appear

mf dont give u

ie will slightly narrow it down but wont be the only thing shown

and other items such as QSS work perfectly when u type it in as does ROA

but not everything works