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