Perhaps you should try some spelling variations:
"hoi ngu java snippets" » "hoi ngu va snippets", "doi ngu java snippets", "hoc ngu java snippets", "noi ngu java snippets", "hoi ngu java slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("hoi ngu java snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoi ngu java snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoi ngu java snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoi ngu java snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.