Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den thuc moi snippets" » "dan thuc moi snippets", "kien thuc moi snippets", "diem thuc moi snippets", "den thuoc moi snippets", "den thu moi snippets", "den thuc doi 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 thuc moi 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 thuc moi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den thuc moi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den thuc moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.