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