With the help of this application Quran Search, you can search any word in Quran Majeed very easily.

Its unique feature is "search as you type" or " live search" so:
1)you can search a word even you don't know it's proper Arabic dictation.
2)you can initiate search even through a single harf (letter).

how to use:
look at all the given screenshots on play store carefully.

use option of
" بحث"
for searching.
as soon as you start typing any search query, a list of words will appear below the search box.
continue typing till the word you want to search is shown in the list.
simply tap the word in the list and wait for a result. all the aayah containing that word will be shown. tap any ayah to read it completely.
if failed to search any word which is actually present in Quran then add as a prefix, either of following huroof
و , ف , ك , ل
without space in the beginning of the word you want to search.

the app uses built-in qwerty keyboard.
to access keyboard, tap on the bottom right corner of screen.