Perhaps you should try some spelling variations:
"duong cac code snippets" » "luong cac code snippets", "dung cac code snippets", "cuong cac code snippets", "duong cac cong snippets", "duong cac co snippets", "duong cac che snippets", "duong cac code slippers"
"chung v code snippets" » "chung vi code snippets", "chung ve code snippets", "chuong v code snippets", "chung v 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: (((("chung v code snippets") or ("duong cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("chung v code snippets") OR ("duong cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( chung v code snippets ) or ( duong cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("chung v code snippets") or ("duong cac code snippets"))) or ("locating bug code snippets"))*.