Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duoc van cau snippets" » "duoc va cau snippets", "duc van cau snippets", "duoc ban cau snippets", "duoc van dau snippets", "duoc van hau snippets", "duoc 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: (((("duoc 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: (((("duoc van cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duoc van cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duoc van cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.