Perhaps you should try some spelling variations:
"duong cac cach snippets" » "duong cac code snippets", "luong cac cach snippets", "dung cac cach snippets", "cuong cac cach snippets", "duong cai cach snippets", "duong cuoc cach snippets", "duong va cach snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("duong cac cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong cac cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( duong cac cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong cac cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.