Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
ty hang » ly hang, ty xang, thi hang
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ca cua » co cua
ve tao » ve bao, de tao, ve tac
ca hoi » cau hoi, cua hoi, co hoi
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty hang ((ca hoi) OR (xa hoi)). hieu ve tao duoc ((va hanh) or (va thanh)) ca cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty hang ((ca hoi) OR (xa hoi)). hieu ve tao duoc ((va hanh) OR (va thanh)) ca cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty hang ((ca hoi) OR (xa hoi)). hieu ve tao duoc ((va hanh) or (va thanh)) ca cua su".
• Adding a wildcard symbol may retrieve word variants: thu sach ty hang ((ca hoi) OR (xa hoi)). hieu ve tao duoc ((va hanh) or (va thanh)) ca cua su*.