Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"huu khang o2 snippets" » "huu han o2 snippets", "huu hanh o2 snippets", "huu hang o2 snippets", "huu khang voi snippets", "huu khang a 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: (((("huu khang 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: (((("huu khang o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( huu khang o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("huu khang o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.