Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet hung du snippets" » "viet huong du snippets", "viet trung du snippets", "viet dung du snippets", "viet hung vu snippets", "viet hung tu 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: (((("viet hung du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet hung du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet hung du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet hung du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.