Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cua van don snippets" » "cua ban don snippets", "cua dan don snippets", "cua vat don snippets", "cua van dong snippets", "cua van doan snippets", "cua van dan 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 van don 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 van don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cua van don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cua van don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.