Perhaps you should try some spelling variations:
"toc cao dong snippets" » "toc cao code snippets", "toc cao dang snippets", "toc lao dong snippets", "toc cao cong snippets", "hoc cao dong snippets", "toc dao dong snippets", "toc co dong snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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: (((("python using java snippets") or ("toc cao dong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("toc cao dong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( toc cao dong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("toc cao dong snippets"))) or ("locating bug core snippets"))*.