Perhaps you should try some spelling variations:
hanh via » hanh vi, hanh va, anh va
su sach » so sach, vu sach
cao hoc » cho hoc, chat hoc
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
via cua » gia cua, gian cua, giau cua
y nang » ky nang, ly nang, v nang
va bao » va bai
bao bo » bac bo, ban bo, nao bo
cua te » cua tu
bo va » bao va, do va, so va

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((cao hoc) OR (co hoc)). hieu va bao bo va hanh via cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((cao hoc) OR (co hoc)). hieu va bao bo va hanh via cua te*.