Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
hanh ve » hanh vi, hanh va, hanh kem
hoc hoi » hoc khoi, hoc hoa, hoc noi
ve cua » le cua, de cua, te cua
su sac » su sach, su cac, su xac
he nam » ha nam, nghe nam
sac ky » cac ky, sai ky
ho hoi » hoa hoi, hoi hoi, co hoi
ve nam » va nam, le nam, te nam

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: su sac ky nang ((ho hoi) OR (hoc hoi)). hieu ((ve nam) OR (he nam)) thuc van hanh ve cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((ho hoi) or (hoc hoi)). hieu ((ve nam) OR (he nam)) thuc van hanh ve cua viet~".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((ho hoi) or (hoc hoi)). hieu ((ve nam) OR (he nam)) thuc van hanh ve cua viet*.