Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va
cao duc » dao duc, cao suc, giao duc
cua tu » cua tuc, cua su, cua cu
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi

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) OR (hieu van)) cao duc va hanh hai 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) OR (hieu van)) cao duc va hanh hai 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) OR (hieu van)) cao duc va hanh hai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) or (ma hoa)). ((hieu ve) OR (hieu van)) cao duc va hanh hai cua tu*.