Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van phong o2 snippets" » "van dong o2 snippets", "hai phong o2 snippets", "van phong mot snippets", "van phong voi snippets", "van phong va 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: (((("van phong 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: (((("van phong o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van phong o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van phong o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.