Perhaps you should try some spelling variations:
ban hanh » ban hang
cau tren » cu tren, dau tren, ca tren
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
vi cau » va cau, ve cau, di 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 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 tren*.