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