Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quoc khoi de snippets" » "quoc hoi de snippets", "buoc khoi de snippets", "cuoc khoi de snippets", "quoc khi de snippets", "quoc khoa de snippets", "quoc khoi 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 khoi de 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 khoi de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc khoi de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc khoi de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.