Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
kho tang » cao tang
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
duc ban » duc tan, duc van, dua ban
dai cuu » dai cua, dai huu
hieu ve » hieu va
cam duc » cam xuc, cao duc, pham duc
su sac » su sach, su cac, su xac
ma hoi » mai hoi, xa hoi, ma hoa

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