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