Do so by double-clicking on the blue Preview icon that looks like overlapping snapshots, then clicking on File in the menu bar and Open... in the drop-down menu. Select a file in the dialog box and click on Open. Preview is Apple's native image viewer app that's automatically included with most versions of Mac OS.    It's in the upper-right corner of the window. All instances of the word or phrase you're looking for will be highlighted in the document. Click on < or > below the search field to navigate among the places where the word or phrase occurs in the document.
प्रीव्यू एप (Preview app) में पीडीएफ डॉक्यूमेंट खोलें: मेन्यू बार में Edit पर क्लिक करें।  Find Find… "Search" फील्ड में एक शब्द या वाक्य लिखें: Next पर क्लिक करें: