Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
hoc hoi » hoc khoi, hoc hoa, hoc noi
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
hanh le » thanh le, hanh ve, hanh de
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ho hoi » hoa hoi, hoi hoi, co hoi
va cam » va cham, va cac, va cao
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: su sac ky nang ((ho hoi) or (hoc hoi)). hieu va cam tuc van hanh le cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((ho hoi) OR (hoc hoi)). hieu va cam tuc van hanh le cua viet*.