Perhaps you should try some spelling variations:
hanh via » hanh vi, hanh va, anh va
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
via cua » gia cua, gian cua, giau cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va bao » va bai
bo va » bao va, do va, co va
so va » so van, so vat, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang cao hoi. lieu va bao ((bo va) OR (so va)) hanh via cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cao hoi. lieu va bao ((bo va) OR (so va)) hanh via cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoi. lieu va bao ((bo va) OR (so va)) hanh via cua tre*.