Perhaps you should try some spelling variations:
cong cong » trong cong, dung cong, dang cong
cac chu » cac thu, cac che, ca chu
cac khu » cac thu, cac khoi, cac kieu
ban ve » ban va
ly thi » ly thoi, le thi, ly tai
y thi » ky thi, y thai, _ thi
tuyen » truyen, quyen
dong » dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tuyen tap ((cac chu) OR (cac khu)) đe co ban ve ((y thi) or (ly thi)) ((cong cong) or (cong dong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tuyen tap ((cac chu) OR (cac khu)) đe co ban ve ((y thi) OR (ly thi)) ((cong cong) OR (cong dong)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tuyen tap ((cac chu) OR (cac khu)) đe co ban ve ((y thi) or (ly thi)) ((cong cong) or (cong dong))".
• Adding a wildcard symbol may retrieve word variants: tuyen tap ((cac chu) OR (cac khu)) đe co ban ve ((y thi) or (ly thi)) ((cong cong) or (cong dong))*.