Perhaps you should try some spelling variations:
"do ngoc cong snippets" » "do ngoc code snippets", "do ngoc cuong snippets", "do nuoc cong snippets", "do ngoc long snippets", "duc ngoc cong snippets", "do nguoi cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data 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: (((("python using java snippets") or ("do ngoc cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("do ngoc cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( do ngoc cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("do ngoc cong snippets"))) or ("locating bug core snippets"))*.