Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vao van chi snippets" » "vo van chi snippets", "dao van chi snippets", "cao van chi snippets", "vao van chien snippets", "vao luan chi snippets", "vao van chat 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: (((("vao van chi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vao van chi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vao van chi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vao van chi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.