Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
lam quoc » lam duoc, nam quoc, lam thuoc
quoc ban » quoc bao, quoc lan, quoc quan
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
van lam » van nam
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty xang xa hoi. hieu van lam quoc ban thanh vai ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang xa hoi. hieu van lam quoc ban thanh vai ((cua tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty xang xa hoi. hieu van lam quoc ban thanh vai ((cua tre) or (va triet))*.