Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"danh cho code snippets" » "danh cho cong snippets", "danh cfd code snippets", "danh cho con snippets", "doanh cho code snippets", "dan cho code snippets", "dinh cho code snippets"
"locating bug core snippets" » "locating bug code snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("danh cho code snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"danh cho code snippets\") OR (\"dung java java snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( danh cho code snippets ) OR ( dung java java snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh cho code snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets"))*.