Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu dan hoc snippets" » "hieu van hoc snippets", "sieu dan hoc snippets", "hieu dac hoc snippets", "hieu dan toc snippets", "hieu dai hoc 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: (((("hieu dan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hieu dan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu dan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu dan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.