Perhaps you should try some spelling variations:
ban thanh » ban hanh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
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 van cam duc ((ban thanh) or (((ban hang) OR (ngan hang)))) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu van cam duc ((ban thanh) OR (((ban hang) OR (ngan hang)))) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu van cam duc ((ban thanh) or (((ban hang) OR (ngan hang)))) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu van cam duc ((ban thanh) or (((ban hang) OR (ngan hang)))) vai cua tre*.