Perhaps you should try some spelling variations:
quyen tai » xuyen tai, nguyen tai, truyen tai
cong cong » cong dong, trong cong, dung cong
cac thu » cach thuc, cac thoi
cac khu » cac khoi, cac kieu
ty thuc » ty thuoc, tu thuc, tri thuc
cac chu » cac che, ca chu, cac cau
ban le » ban ve
y thuc » y thuoc, _ thuc, a thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: quyen tai ((((cac chu) or (cac thu))) or (cac khu)) đe co ban le ((y thuc) OR (ty thuc)) cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tai ((((cac chu) OR (cac thu))) OR (cac khu)) đe co ban le ((y thuc) OR (ty thuc)) cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tai ((((cac chu) or (cac thu))) or (cac khu)) đe co ban le ((y thuc) OR (ty thuc)) cong cong".
• Adding a wildcard symbol may retrieve word variants: quyen tai ((((cac chu) or (cac thu))) or (cac khu)) đe co ban le ((y thuc) OR (ty thuc)) cong cong*.