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