Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong tich so snippets" » "cong tinh so snippets", "cong lich so snippets", "cong trinh so snippets", "cong tich bao snippets", "cong tinh son 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: (((("cong tich so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong tich so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong tich so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong tich so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.