Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
lam quoc » lam duoc, nam quoc, lam thuoc
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
van lam » van nam

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 hang) OR (ly hang)) xa hoi. hieu van lam quoc ban thanh hai ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ly hang)) xa hoi. hieu van lam quoc ban thanh hai ((cua tre) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) OR (ly hang)) xa hoi. hieu van lam quoc ban thanh hai ((cua tre) or (va triet))*".