Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
cac kieu » cach tieu, cac yeu, tac kiem
cac thu » cach thuc, cac thoi
ban ve » ban va
ky te » y te, ly te
ky le » ky la

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 thu) or (cac kieu)) đe co ban ve ((ky te) OR (ky le)) ((cong cong) or (dung cong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac thu) OR (cac kieu)) đe co ban ve ((ky te) OR (ky le)) ((cong cong) OR (dung cong)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((cac thu) or (cac kieu)) đe co ban ve ((ky te) OR (ky le)) ((cong cong) or (dung cong))".
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac thu) or (cac kieu)) đe co ban ve ((ky te) OR (ky le)) ((cong cong) or (dung cong))*.