Perhaps you should try some spelling variations:
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
hieu va » hieu qua
cau luc » cau truc, cau phuc
luc ban » duc ban, cuc ban, luc bat
va cau » van cau, va cac, va dau
vi cau » ve cau, di cau, viet cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty hang xa hoi. ((lieu va) or (hieu va)) cau luc ban hanh ((vi cau) OR (va cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty hang xa hoi. ((lieu va) OR (hieu va)) cau luc ban hanh ((vi cau) OR (va cau)) tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty hang xa hoi. ((lieu va) or (hieu va)) cau luc ban hanh ((vi cau) OR (va cau)) tren*".