Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"mong duy de snippets" » "cong duy de snippets", "mong du de snippets", "hoang duy de snippets", "mong duy den snippets", "mong duy ke 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: (((("mong duy 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: (((("mong duy de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( mong duy de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("mong duy de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.