Perhaps you should try some spelling variations:
"dong mon cach snippets" » "dong mon code snippets", "dong von cach snippets", "dong son cach snippets", "dong co cach snippets", "dong mot cach snippets", "dong dong cach snippets", "dong minh cach 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 mon cach 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 mon cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong mon cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong mon cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.