Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
ma hoi » xa hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
su sac » su sach, su cac, su xac

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 (ky dang)) ((ma hoi) OR (mai hoi)). hieu va cam duc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ky tang) OR (ky dang)) ((ma hoi) OR (mai hoi)). hieu va cam duc ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ky tang) or (ky dang)) ((ma hoi) OR (mai hoi)). hieu va cam duc ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((ky tang) or (ky dang)) ((ma hoi) OR (mai hoi)). hieu va cam duc ban thanh dai cua tre*.