Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa
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 » cao duc, pham duc, nam duoc
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac 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 xac ky tang ma hoi. hieu ve ((cam duc) or (cam xuc)) ban ((thanh hai) OR (thanh san)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky tang ma hoi. hieu ve ((cam duc) OR (cam xuc)) ban ((thanh hai) OR (thanh san)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky tang ma hoi. hieu ve ((cam duc) or (cam xuc)) ban ((thanh hai) OR (thanh san)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky tang ma hoi. hieu ve ((cam duc) or (cam xuc)) ban ((thanh hai) OR (thanh san)) cua tre*.