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