Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu cao » chieu cao, hieu cac, hieu ca
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang ma » hang va, hang ca, tang ma
toc gia » toc giay, tac gia, hoc giao
cua tre » cua te, cuu tre, dua tren
ma hoi » mai hoi, xa hoi, ma hoa

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 ty hang ma hoi. hieu cao chat ((toc gia) OR (quoc gia)) hanh vi ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hang ma hoi. hieu cao chat ((toc gia) OR (quoc gia)) hanh vi ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang ma hoi. hieu cao chat ((toc gia) OR (quoc gia)) hanh vi ((cua tre) or (cua triet))*.