Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
le manh » le minh, le thanh
ba hoi » bia hoi, xa hoi, ba hoa
ve cao » va cao, ve bao, ve cac
dai va » mai va
thiet » thieu

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 ((le manh) OR (le anh)) ba hoi. hieu ve cao duc ((va hanh) or (va danh)) dai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((le manh) OR (le anh)) ba hoi. hieu ve cao duc ((va hanh) OR (va danh)) dai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((le manh) OR (le anh)) ba hoi. hieu ve cao duc ((va hanh) or (va danh)) dai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ((le manh) OR (le anh)) ba hoi. hieu ve cao duc ((va hanh) or (va danh)) dai va thiet*.