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

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ((ky tang) or (kho 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 sac ((ky tang) OR (kho tang)) ((ma hoi) OR (mai hoi)). hieu ve pham duc ban thanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky tang) or (kho tang)) ((ma hoi) OR (mai hoi)). hieu ve pham duc ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) or (kho tang)) ((ma hoi) OR (mai hoi)). hieu ve pham duc ban thanh tai cua tre*.