Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cach thuc » anh thuc, cac thu
cong cong » trong cong, dung cong, dang cong
cac chu » cac thu, cac che, cac khu
ban ve » ban va
y tai » ly tai, y thai, ty tai
ve y » ve ky, ve _, ke y
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: quyen tap ((cac chu) or (cach thuc)) đe co ban ve y tai ((cong cong) OR (cong dong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac chu) OR (cach thuc)) đe co ban ve y tai ((cong cong) OR (cong dong)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((cac chu) or (cach thuc)) đe co ban ve y tai ((cong cong) OR (cong dong))".
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac chu) or (cach thuc)) đe co ban ve y tai ((cong cong) OR (cong dong))*.