Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
ma hoi » xa hoi, ma hoa, me hoi
su xac » pu xac, su cac

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) or (su xac)) ky tang ((ma hoi) or (mai hoi)). hieu ve pham duc ban thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (su xac)) ky tang ((ma hoi) OR (mai hoi)). hieu ve pham duc ban thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (su xac)) ky tang ((ma hoi) or (mai hoi)). hieu ve pham duc ban thanh tai cua tre*.