Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ((ky sang) OR (ky tang)) xa hoi. hieu van cam xuc va hanh vi ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((ky sang) OR (ky tang)) xa hoi. hieu van cam xuc va hanh vi ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ((ky sang) OR (ky tang)) xa hoi. hieu van cam xuc va hanh vi ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: tu cac ((ky sang) OR (ky tang)) xa hoi. hieu van cam xuc va hanh vi ((cuu tre) or (cau treo))*.