Perhaps you should try some spelling variations:
"chung hoc cong snippets" » "trung hoc cong snippets", "dung hoc cong snippets", "hung hoa cong snippets", "chung hoc co snippets", "chung cac cong snippets", "chung hoc dung snippets"
"hang java java snippets" » "hang va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("chung hoc cong snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("chung hoc cong snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( chung hoc cong snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("chung hoc cong snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.