nothing more / nothing special

  1. They escaped the accident with nothing more than bruising.
  2. Most probably, it was nothing more than a feeble attempt to win public sympathy.
  3. There was nothing special in the meal but the dessert was very delicious.
  4. Raman was considered nothing special in his school days but now he is a hero in politics.
  5. Sita is not the least bit interested in marrying Raman.
    6a. Kindly look in to the matter.
    6b. Kindly look into the matter.
  6. Many rowdies entered into her office all at once and molested her.
    Please correct all.

Use 6b, not 6a.

7 could be misconstrued.

Please recast the #7 so that it can not be misconstrued.

It depends on what you mean.

The term ‘rowdies’ is not natural in that sentence for a start.
Then I am not certain you are using the term ‘molested’ in the right way. It doesn’t just mean ‘attacked’ - it indicates a very specific type of attack. Did you mean to indicate that she was sexually assaulted?
Also ‘all at once’, with the meaning ‘suddenly’ is in the wrong place, and makes it appear as if you are saying they all came through the doorway at exactly the same time - probably a physical impossibility.

This is possibly what you require:
All at once a group of rowdy people entered her office and attacked her.