Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
cua triet » cua viet, su triet, va triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
mau hoi » cau hoi, mai hoi, mau ho
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
cua tre » cua te, cuu tre, dua tren
ky anh » ky danh, ly anh, ty anh
gia » giao

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: te sach ky anh mau hoi. hieu ve ((cac tuc) OR (cac tac)) gia thanh hai ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky anh mau hoi. hieu ve ((cac tuc) or (cac tac)) gia thanh hai ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky anh mau hoi. hieu ve ((cac tuc) or (cac tac)) gia thanh hai ((cua tre) OR (cua triet))*.