Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thanh dai » thanh hai, thanh tai, thanh oai
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, nam duoc
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
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 ky tang ma hoi. hieu ve ((cam duc) OR (pham duc)) ban ((thanh dai) or (thanh dat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang ma hoi. hieu ve ((cam duc) OR (pham duc)) ban ((thanh dai) OR (thanh dat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang ma hoi. hieu ve ((cam duc) OR (pham duc)) ban ((thanh dai) or (thanh dat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang ma hoi. hieu ve ((cam duc) OR (pham duc)) ban ((thanh dai) or (thanh dat)) cua tre*.