Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
ro hoi » o hoi, mo hoi, ro doi
co hoi » co hoc, co loi
ve cam » ve cham, ve cac, va cam
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 sai ky nang ((ro hoi) OR (co hoi)). hieu ve cam xuc va hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ((ro hoi) OR (co hoi)). hieu ve cam xuc va hanh vi ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang ((ro hoi) OR (co hoi)). hieu ve cam xuc va hanh vi ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((ro hoi) OR (co hoi)). hieu ve cam xuc va hanh vi ((cua tre) or (cau tren))*.