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

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