Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duong van do snippets" » "duong va do snippets", "luong va do snippets", "dang van do snippets", "duong van dao snippets", "duong van de snippets", "duong van du 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: (((("duong van do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong van do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong van do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong van do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.