Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"viet van lan snippets" » "viet nam lan snippets", "viet anh lan snippets", "viet ha lan snippets", "viet van lang snippets", "viet van luan snippets", "viet van ban snippets", "viet van lan slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("viet van lan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet van lan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet van lan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet van lan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.