Perhaps you should try some spelling variations:
quyen tai » xuyen tai, nguyen tai, truyen tai
cac cau » cac mau, bac cau, ca cau
cac thu » cach thuc, cac thoi
cac khu » cac khoi, cac kieu
y thuoc » ly thuoc, ty thuoc, 3 thuoc
ban ly » ban lay, bang ly, ban le
y thuc » ty thuc, _ thuc, a thuc
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 tai ((((cac cau) or (cac thu))) or (cac khu)) đe co ban ly ((y thuc) OR (y thuoc)) cong dong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tai ((((cac cau) OR (cac thu))) OR (cac khu)) đe co ban ly ((y thuc) OR (y thuoc)) cong dong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tai ((((cac cau) or (cac thu))) or (cac khu)) đe co ban ly ((y thuc) OR (y thuoc)) cong dong".
• Adding a wildcard symbol may retrieve word variants: quyen tai ((((cac cau) or (cac thu))) or (cac khu)) đe co ban ly ((y thuc) OR (y thuoc)) cong dong*.