Perhaps you should try some spelling variations:
"dong san cham snippets" » "dong san code snippets", "cong san cham snippets", "dong bang cham snippets", "dong von cham snippets", "dong san pham snippets", "dong san chay snippets", "dong gian cham 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 san 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 san cham snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong san cham snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong san cham snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.