Searching the Qur'an can be done as most other online text documents:
You can search the Qur'an using a web search engine. E.g. quran patience and prayer
. This will often give the surah and ayah numbers (in this example 2:153), and we can go to the URL https://quran.com/2/153
.
Use the search function at Quran.com. E.g. patience and prayer
.
I have a Qur'an app on my iPhone: Quran by Quran.com, Mohamad Afifi. It's searchable.
Knowing what to search for is the challenge: it takes time to become familiar with how the Qur'an (or one of its translations) is formulated. Nothing is better here than actually having read the Qur'an, so you're aware of its contents.
It's important to understand that much of what's in the Qur'an cannot just be taken at face value. For example, Qur'an 4:119 quotes Satan saying I will command them so they will change the creation of Allah. Then a question might arise: does this apply to circumcision? (When we need to be careful.)
To help understand how we apply the instructions in the Qur'an, we use ahadith, tafsir, and fatawa.
Generally, if you web search for fatwa [topic I'm interested in]
you'll find some fatawa that discuss the topic, giving relevant references to the Qur'an (and ahadith). In this example, we might search for fatwa sex with her husband whenever he requests it
and the top hit is an IslamWeb fatwa. It doesn't give an exact source, but it links to another IslamWeb fatwa which gives the hadith:
The Prophet (Sallallahu Alaihi wa Sallam) said: "If a woman spends the night deserting her husband's bed (does not sleep with him), then the angels send their curses on her till she comes back (to her husband)" [Reported by Imams al-Bukhari and Muslim ].
The hadith sources al-Bukhari and Muslim can be found on Sunnah.com, and with a bit of effort, we can find those ahadith: Sahih al-Bukhari 5194 and Sahih Muslim 1436 c.
In this example, Qur'an 4:34 says righteous women are devoutly obedient, which doesn't say exactly "the wife must have sex on demand". Instead, it is interpreted more generally as an instruction for the wife to obey her husband in what is permissible (IslamWeb).