Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau treo » cau theo, cau tren, cau triet
thanh ve » hanh ve, thanh va, thanh vien
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
ly nang » ky nang, ly hang, ly vang
cam duc » cam xuc, cao duc, pham duc

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 ((ly nang) or (ty xang)) xa hoi. hieu van cam duc ban thanh ve ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ty xang)) xa hoi. hieu van cam duc ban thanh ve ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (ty xang)) xa hoi. hieu van cam duc ban thanh ve ((cua tre) or (cau treo))*.