Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
va thanh » gia thanh, ban thanh, va tinh
su triet » su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
chu duc » thu duc, chua duoc, cuu duoc
su viet » so viet
co hoi » co hoc, co loi
va chu » va che, va cau, va chi
o hoi » o hoc, o hai, o hoa

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 ky nang ((o hoi) or (co hoi)). lieu va chu duc va thanh lam ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (co hoi)). lieu va chu duc va thanh lam ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) or (co hoi)). lieu va chu duc va thanh lam ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (co hoi)). lieu va chu duc va thanh lam ((su triet) OR (su viet))*.