Perhaps you should try some spelling variations:
te sach » toc sach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
ve cao » va cao, ve bao, ve cac
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: te sach y nang ((ma hoi) or (ma hoa)). hieu ve cao duc ((va hanh) OR (va danh)) dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoi) OR (ma hoa)). hieu ve cao duc ((va hanh) OR (va danh)) dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) or (ma hoa)). hieu ve cao duc ((va hanh) OR (va danh)) dai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) or (ma hoa)). hieu ve cao duc ((va hanh) OR (va danh)) dai cua tu*.