Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cac thuat » va thuat, hoc thuat, cac chat
cong cong » trong cong, dung cong, dang cong
cac thu » cach thuc, cac thoi
ban ke » ban kem, ban ve, ban le
ty tai » ly tai, tu tai, te tai
ke ty » ke ky, ke y, ke ly
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 ((cac thuat) or (cac thu)) đe co ban ke ty tai ((cong cong) or (cong dong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac thuat) OR (cac thu)) đe co ban ke ty tai ((cong cong) OR (cong dong)).
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac thuat) or (cac thu)) đe co ban ke ty tai ((cong cong) or (cong dong))*.