Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viec hoi chu snippets" » "viec thoi chu snippets", "viec voi chu snippets", "viec khoa chu snippets", "viec hoi chuc 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: (((("viec hoi chu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viec hoi chu snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viec hoi chu snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viec hoi chu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.