Perhaps you should try some spelling variations:
luyen tap » tuyen tap, luyen thi
cong cong » cong dong, trong cong, dung cong
cac chu » cac thu, cac che, ca chu
cac khu » cac thu, cac khoi, cac kieu
te cong » tai cong, thi cong, thu cong
ve y » ve ky, te y
ve _ » va _
ke y » ke ky, ke o

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

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