Perhaps you should try some spelling variations:
tuyen phap » truyen phap, thuyet phap, truyen phan
phap cach » phap cac, nhan cach, phan cac
cach thuc » anh thuc, cac thu
cong cong » trong cong, dang cong
dung cong » dung trong
ban vat » bang vat, ben vat, ban va
vat ky » vat ly, va ky, vat y

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tuyen phap cach thuc đe co ban vat ky thi ((((cong cong) OR (dung cong))) OR (cong dong))~.
• Adding a wildcard symbol may retrieve word variants: tuyen phap cach thuc đe co ban vat ky thi ((((cong cong) or (dung cong))) or (cong dong))*.