Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
toan cong » tran cong, doan cuong, toan trong
cac kieu » cach tieu, cac yeu, tac kiem
cac chu » cac thu, cac che, cac khu
ban ve » ban va
ve y » ve ky, ve _, ke y
y ke » ly ke, y te, _ ke
thong » trong

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