Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vu sach » vu bach, su sach, vu khach
duc ban » duc tan, duc van, dua ban
vai cua » dai cua, hai cua, lai cua
so sanh » do sanh
ly hang » ly quang
vi cua » di cua
qua ca » qua cac, qua cua, qua cai
ca duc » cao duc, cua duc, ca dua
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sanh)) ly hang va hoi. hieu qua ca duc ban thanh ((vi cua) OR (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sanh)) ly hang va hoi. hieu qua ca duc ban thanh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sanh)) ly hang va hoi. hieu qua ca duc ban thanh ((vi cua) OR (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sanh)) ly hang va hoi. hieu qua ca duc ban thanh ((vi cua) OR (vai cua)) te*.