Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den hai cua snippets" » "den ha cua snippets", "den vai cua snippets", "dung hai cua snippets", "den thai cua snippets", "den hoi cua snippets", "den dai 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 hai 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 hai cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den hai cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den hai cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.