Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
va thanh » gia thanh, ban thanh, va tinh
sach ky » sac ky, sach y, sach ty
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
dang ma » dang mau, dang mam, dang mat
hieu ve » hieu van
ky dang » ky nang, ky danh
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang ma hoi. ((hieu ve) or (hieu va)) cam xuc ((va thanh) or (ban hang)) vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang ma hoi. ((hieu ve) OR (hieu va)) cam xuc ((va thanh) OR (ban hang)) vai cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang ma hoi. ((hieu ve) or (hieu va)) cam xuc ((va thanh) or (ban hang)) vai cua tu*.