Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den trinh le snippets" » "den tinh le snippets", "dan trinh le snippets", "tien trinh le snippets", "den trinh ly snippets", "den trinh he snippets", "den trinh ve 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 trinh le 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 trinh le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den trinh le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den trinh le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.