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