Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet da mon snippets" » "viet dao mon snippets", "viet dat mon snippets", "viet ha mon snippets", "viet dap mon snippets", "viet dan mon snippets", "viet da mo 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 da mon 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 da mon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet da mon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet da mon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.