Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
va tinh » may tinh
doi cua » dai cua, hoi cua, dong cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
van cao » van dao, van bao, van hao
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ma hoi. hieu van cao duc ((va hanh) or (va tinh)) ((di cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu van cao duc ((va hanh) OR (va tinh)) ((di cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu van cao duc ((va hanh) or (va tinh)) ((di cua) or (doi cua)) tre*.