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