Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"mot cong don snippets" » "moi cong don snippets", "hoc cong don snippets", "bo cong don snippets", "mot cong dong snippets", "mot cong doan snippets", "mot cong dan 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: (((("mot cong don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("mot cong don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( mot cong don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("mot cong don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.