Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
va triet » va thiet, va trien, ve triet
nam quoc » nam duoc, nam buoc, nam thuoc
hieu van » hieu va, thien van, lieu va
lam quoc » lam duoc, lam thuoc, lam truoc
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang

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 xa hoi. hieu van ((lam quoc) OR (nam 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 hang xa hoi. hieu van ((lam quoc) OR (nam 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 hang xa hoi. hieu van ((lam quoc) OR (nam quoc)) ban thanh vai ((cua tre) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang xa hoi. hieu van ((lam quoc) OR (nam quoc)) ban thanh vai ((cua tre) or (va triet))*.