Perhaps you should try some spelling variations:
"data nuoc cham snippets" » "data nuoc code snippets", "dat nuoc cham snippets", "dat duoc cham snippets", "dau nuoc cham snippets", "data nuoc chau snippets", "data nuoc chay snippets", "data nguoi 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: (((("data nuoc 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: (((("data nuoc cham snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( data nuoc cham snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("data nuoc cham snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.