Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
xuc van » duc van, luc van, vuc van
ca viet » va viet, co viet, hoa viet
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
ve cai » va cai, ve cac, ve tai
o hoi » co hoi, o hoc, o hai

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 sach y nang o hoi. hieu ((ve cai) OR (va cac)) xuc van hanh vi ((cua vat) OR (ca viet))~.
• Adding a wildcard symbol may retrieve word variants: su sach y nang o hoi. hieu ((ve cai) or (va cac)) xuc van hanh vi ((cua vat) or (ca viet))*.