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