Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nao so cong snippets" » "nao bo cong snippets", "nao cao cong snippets", "nao hoc cong snippets", "nam so cong snippets", "cao so 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: (((("nao so 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: (((("nao so cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nao so cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nao so cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.