Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"when hoc dan slippers" » "khien hoc dan slippers", "dien hoc dan slippers", "hen ho dan slippers", "when hoc dan slippery", "when hoc dan grippers"
"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: (((("when hoc dan slippers") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("when hoc dan slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( when hoc dan slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("when hoc dan slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.