Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong son cao snippets" » "dong von cao snippets", "dong san cao snippets", "hoang son cao snippets", "dong toan cao snippets", "dong cong cao snippets", "dong dong cao 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 son cao 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 son cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong son cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong son cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.