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

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) OR (ang 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) OR (ang xa)) hoi. hieu van lam quoc ban thanh vai ((cua tre) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xang xa) OR (ang 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) OR (ang xa)) hoi. hieu van lam quoc ban thanh vai ((cua tre) or (va triet))*.