Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
quyen ca » quyen cap, quyen cua, quyen xa
ca cach » cai cach, cac cach, ca cac
ban vat » bang vat, ben vat, ban va
ky thuc » ky thua, y thuc, ky thuat
ty thuc » ty thuoc, tu thuc, y thuc
ky thu » ly thu, ky thi, ky thuat
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 ca cach thuc đe co ban vat ((ky thu) or (((((ky thuc) OR (ty thuc))) or (ky tuc)))) cong dong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen ca cach thuc đe co ban vat ((ky thu) OR (((((ky thuc) OR (ty thuc))) OR (ky tuc)))) cong dong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen ca cach thuc đe co ban vat ((ky thu) or (((((ky thuc) OR (ty thuc))) or (ky tuc)))) cong dong".
• Adding a wildcard symbol may retrieve word variants: quyen ca cach thuc đe co ban vat ((ky thu) or (((((ky thuc) OR (ty thuc))) or (ky tuc)))) cong dong*.