Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cach thuc » anh thuc, cac thu
cac chat » cao chat, cac thuat, cac nha
te cong » tai cong, thi cong, thu cong
ca chu » cua chu, ca chua, cac chu
ve ky » va ky, ke ky
ve y » ve _, ke y, te 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 ((((ca chu) or (cac chat))) or (cach thuc)) đe co ban ((ve y) or (ve ky)) te cong dong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((((ca chu) OR (cac chat))) OR (cach thuc)) đe co ban ((ve y) OR (ve ky)) te cong dong.
• Adding a wildcard symbol may retrieve word variants: quyen tap ((((ca chu) or (cac chat))) or (cach thuc)) đe co ban ((ve y) or (ve ky)) te cong dong*.