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