Perhaps you should try some spelling variations:
"dong cac chieu snippets" » "dong cac code snippets", "dong cac chien snippets", "dong cao hieu snippets", "dong cac che snippets", "duong cac chieu snippets", "dong bac chieu snippets", "dung cac chieu 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 cac chieu 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 cac chieu snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong cac chieu snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong cac chieu snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.