Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tham thuc » nham thuc, pham thuc, tam thuc
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
thuc ban » thuoc ban, thuc dan, thu ban
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua hoi » cua moi
va tham » van tham, va cham, va thanh
tai va » thai va, tri va, dai va

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