Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
va thanh » gia thanh, ban thanh, le thanh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu va cau thuc ((va thanh) OR (va tinh)) va ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu va cau thuc ((va thanh) OR (va tinh)) va ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu va cau thuc ((va thanh) OR (va tinh)) va ((cua tre) or (cua triet))*.