Perhaps you should try some spelling variations:
"dong thi cham snippets" » "dong thi code snippets", "duong thi cham snippets", "dang thi cham snippets", "dong tai cham snippets", "dong thi hai snippets", "dong toc cham snippets", "dong thi ha 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 thi 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 thi cham snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong thi cham snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong thi cham snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.