Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
co sach » bo sach, cuon sach, hoc sach
nang ma » tang ma, sang ma, nang cao
van cay » van cau, van bay, van ca
cay cua » ca cua, day cua, cay ca
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
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) or (co sach)) ky nang ma hoi. hieu van cay cua ban thanh vai ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ky nang ma hoi. hieu van cay cua ban thanh vai ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (co sach)) ky nang ma hoi. hieu van cay cua ban thanh vai ((cuu tre) or (cua tre))*.