Perhaps you should try some spelling variations:
"co thi chien snippets" » "co thi code snippets", "co thi hien snippets", "co thi thien snippets", "co thien chien snippets", "cao thi chien snippets", "co thai chien snippets", "do thi chien snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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: (((("co thi chien snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("co thi chien snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( co thi chien snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("co thi chien snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.