Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
hieu vien » hieu hien, hieu viec, thieu nien
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
cao hoi » cau hoi, cao hoc, tao hoi
tuoc va » thuoc va, nuoc va, duoc va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky nang ((cao hoi) OR (co hoi)). hieu vien bach tuoc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ((cao hoi) OR (co hoi)). hieu vien bach tuoc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang ((cao hoi) OR (co hoi)). hieu vien bach tuoc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ((cao hoi) OR (co hoi)). hieu vien bach tuoc va hanh dai cua tre*.