Perhaps you should try some spelling variations:
"dong son cong snippets" » "dong son code snippets", "dong von cong snippets", "dong san cong snippets", "hoang son cong snippets", "dong song cong snippets", "dong bon cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung using java snippets" » "dung ung java snippets", "dung sinh java snippets", "dung uong java snippets", "dung 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: (((("dung using java snippets") or ("dong son cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung using java snippets") OR ("dong son cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung using java snippets ) or ( dong son cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung using java snippets") or ("dong son cong snippets"))) or ("locating bug core snippets"))*.