Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
thanh ve » hanh ve, thanh va, thanh vien
va trien » va truyen, va thiet, va tuyen
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. hieu ve pham duc ban thanh ve ((cua tre) OR (va trien))~.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu ve pham duc ban thanh ve ((cua tre) or (va trien))*.