Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lan dong son snippets" » "lang dong son snippets", "luan dong son snippets", "van dong son snippets", "lan dong von snippets", "lan dong san snippets", "lan hoang son 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: (((("lan dong son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lan dong son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan dong son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan dong son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.