Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cua he toan snippets" » "cua ke toan snippets", "cua he than snippets", "cua le toan snippets", "cua che toan snippets", "cua te toan 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: (((("cua he toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cua he toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cua he toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cua he toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.