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