Yahoo is a mail account that has been used by people from a long time.It is the platform like others which provide access to email application and search engine.you can even see the videos and movies by using it.There are around eight hundred million people who visits Yahoo website every month.It is quite smooth to access but you can’t just escaped from serious bugs like yahoo mail search not working,yahoo mail not working and many more.To control such situations,you need to be in contact of customer support team.
Number of bugs has been fixed by tech experts.You can see the resolution to one of your query:

Why Yahoo mail search not working?

It is required for you to enter your query into the “Search” box at the top.
You are liable to search for an exact quote by using quotations marks surround the term that you use.
There is need to enter term like '"melodic enthusiasm"' to get the messages associated to "melodic enthusiasm" as a phrase.
It is required to select a folder to search in using the menu that appears in front of the search box.
Tap “Enter” or select “Search Mail.”
Now, you should see,whether problem has been resolved or not

If you didn’t find the solution helpful to you,it is better if you use helpline number.Not only the discussed problem”Yahoo mail not working” issue but other related problems can be resolved easily.Technicians will first try to understand your issue and suggest you with some relevant solution that are quite unique.As a user,you will be charged if you take help from experts.The amount that will be charged to you is too low to pay by anybody.When the solution will not be satisfactory,you will not be forced to pay anything.Some other major options can also be used of you need help,these are the online chat and emailing method.You can do the direct chat with experts by using chat box or you can do email to experts to get instant answers.If someone wants help for free,they can use frequently asked questions and tech support columns.

source: https://www.thehelpus.com/blog/how-do-i-fix-yahoo-mail-problems