Perhaps you should try some spelling variations:
"dong tin cham snippets" » "dong tin code snippets", "thong tin cham snippets", "luong tin cham snippets", "dong kinh cham snippets", "dong tinh cham snippets", "dong trinh cham snippets", "dong 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: (((("dong 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: (((("dong tin cham snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong tin cham snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong tin cham snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.