Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
hanh le » thanh le, hanh ve, hanh de
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
co hoi » co loi
luc va » duc va, tuc va, loc va
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((co hoi) or (co hoc)). ((hieu ve) or (hieu qua)) cau luc va hanh le cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((co hoi) OR (co hoc)). ((hieu ve) OR (hieu qua)) cau luc va hanh le cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((co hoi) or (co hoc)). ((hieu ve) or (hieu qua)) cau luc va hanh le cua triet*.