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