Perhaps you should try some spelling variations:
"dong cac cach snippets" » "dong cac code snippets", "duong cac cach snippets", "dong bac cach snippets", "dung cac cach snippets", "dong cai cach snippets", "dong cuoc cach snippets", "dong va cach snippets"
"locating bug core snippets" » "locating bug code snippets"
"hang java java snippets" » "hang 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 cac cach snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong cac cach snippets") OR ("hang java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong cac cach snippets ) or ( hang java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong cac cach snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))*.