Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duy phan slippers" » "van duc phan slippers", "van dung phan slippers", "van duy khanh slippers", "van duy phan slippery", "van duy phan 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 phan 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 phan slippers") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van duy phan slippers ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van duy phan slippers") or ("python using java snippets"))) or ("locating bug code snippets"))*.