Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duy trac slippers" » "van quy tac slippers", "van huy tran slippers", "van duy tri slippers", "van dung trac slippers", "van duy trac slippery", "van duy trac 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: (((("van duy trac slippers") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van duy trac slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van duy trac slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duy trac slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.