Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
mai khoi » mai khoa, tai khoa, cac khoi
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
mai hoi » dai hoi, lai hoi, mai doi
y nang » ky nang, ly nang, v nang

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 ((mai hoi) OR (mai khoi)). ((hieu ve) or (lieu va)) chay dua ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((mai hoi) OR (mai khoi)). ((hieu ve) OR (lieu va)) chay dua ban thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((mai hoi) OR (mai khoi)). ((hieu ve) or (lieu va)) chay dua ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((mai hoi) OR (mai khoi)). ((hieu ve) or (lieu va)) chay dua ban thanh vai cua tre*.