Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
dua ban » dia ban, cua ban, qua ban
cam dua » ca dua, cay dua, chay dua
hieu va » lieu va, hieu qua
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
vi cua » vai cua
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cao

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 va cam dua ban thanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ly hang)) xa hoi. hieu va cam dua ban thanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) OR (ly hang)) xa hoi. hieu va cam dua ban thanh ((vi cua) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) OR (ly hang)) xa hoi. hieu va cam dua ban thanh ((vi cua) or (di cua)) tre*.