Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet van vo snippets" » "viet nam vo snippets", "viet anh vo snippets", "viet ha vo snippets", "viet van von snippets", "viet van vu snippets", "viet van do 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: (((("viet van vo 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 vo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet van vo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet van vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.