Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hai dang o2 snippets" » "dai dang o2 snippets", "hai bang o2 snippets", "hoi dang o2 snippets", "hai dang o snippets", "hai hang o2 snippets", "hai dang noi snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("hai dang o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hai dang o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hai dang o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hai dang o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.