Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den toan cua snippets" » "dien toan cua snippets", "dan toan cua snippets", "den tran cua snippets", "den than cua snippets", "den tan cua snippets", "den doanh cua 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 toan cua 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 toan cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den toan cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den toan cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.