Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong tren du snippets" » "dung tren du snippets", "dong tien du snippets", "dong truyen du snippets", "dong trien du snippets", "dong tren dia 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 tren 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: (((("dong tren du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong tren du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong tren du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.