Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
da thanh » dao thanh, dat thanh, dam thanh
hieu van » hieu va, thien van, lieu va
cuu tre » cau tren, cau treo
hac tac » cac tac, hoc tach, thac cac
cua tre » cua te, cua triet, dua tren
van hac » van hoc, van ha, van hai
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
su cac » tu cac, su cao, su can
su sac » su sach, su xac

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cac)) ky tang xa hoi. hieu van hac tac da thanh vai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su cac)) ky tang xa hoi. hieu van hac tac da thanh vai ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su cac)) ky tang xa hoi. hieu van hac tac da thanh vai ((cua tre) OR (cuu tre))*.