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