Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
vat hanh » vat thanh, van hanh, va hanh
hanh le » thanh le, hanh ve, hanh de
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang x hoi. hieu ((ve cam) or (ve cac)) thuc vat hanh le ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang x hoi. hieu ((ve cam) OR (ve cac)) thuc vat hanh le ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang x hoi. hieu ((ve cam) or (ve cac)) thuc vat hanh le ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang x hoi. hieu ((ve cam) or (ve cac)) thuc vat hanh le ((cua triet) OR (va triet))*.