Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet tiep do snippets" » "viet tien do snippets", "viet tieng do snippets", "viet viet do snippets", "viet tiep doi snippets", "viet tiep 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: (((("viet tiep do 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 tiep do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet tiep do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet tiep do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.