Perhaps you should try some spelling variations:
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
ty dang » ty xang, ty hang, ty dong
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duc ban » duc tan, duc van, dua ban
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty dang) OR (ky dang)) xa hoi. hieu ve pham duc ban hanh vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty dang) OR (ky dang)) xa hoi. hieu ve pham duc ban hanh vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty dang) OR (ky dang)) xa hoi. hieu ve pham duc ban hanh vai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty dang) OR (ky dang)) xa hoi. hieu ve pham duc ban hanh vai ((cua tre) or (cua te))*.