Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 ve) or (lieu va))) or (hieu va)) cao duc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. ((((hieu ve) OR (lieu va))) OR (hieu va)) cao duc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. ((((hieu ve) or (lieu va))) or (hieu va)) cao duc va danh vai cua tre*.