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