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