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
van cau » van dau, van hau, van chat
cau dua » cau qua, cau cua, ca dua
dua ban » dia ban, cua ban, qua ban
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
va hoi » va hoc, va 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 ((((va hoi) or (xa hoi))) or (ma hoa)). hieu van cau dua ban thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((((va hoi) OR (xa hoi))) OR (ma hoa)). hieu van cau dua ban thanh vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((((va hoi) or (xa hoi))) or (ma hoa)). hieu van cau dua ban thanh vai cuu tre*.