Perhaps you should try some spelling variations:
"dong luc code snippets" » "nang luc code snippets", "dong lbm code snippets", "dong luc cong snippets", "dong luc code slippers"
"thong tu code snippets" » "phong tuc code snippets", "thong tin code snippets", "thong ke code snippets", "thong tu code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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 luc code snippets") or ("thong tu code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong luc code snippets") OR ("thong tu code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong luc code snippets ) or ( thong tu code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong luc code snippets") or ("thong tu code snippets"))) or ("locating bug code snippets"))*.