Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
cuu tre » cua tre, cau tren, cau treo
dai cuu » dai cua, dai huu
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
sac ky » sai ky
ve cam » ve cham, ve cac, va cam
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) OR (cac ky)) tang ((ma hoi) or (mai hoi)). hieu ve cam duc ban thanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (cac ky)) tang ((ma hoi) OR (mai hoi)). hieu ve cam duc ban thanh dai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) OR (cac ky)) tang ((ma hoi) or (mai hoi)). hieu ve cam duc ban thanh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) OR (cac ky)) tang ((ma hoi) or (mai hoi)). hieu ve cam duc ban thanh dai cuu tre*.