Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
mai hoi » mai khoi, dai hoi, lai hoi
luc va » duc va, tuc va, loc va
tu sac » tu sach, tu cac, tu san
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((ma hoi) or (mai hoi)). hieu va cam luc va hanh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (mai hoi)). hieu va cam luc va hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((ma hoi) or (mai hoi)). hieu va cam luc va hanh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) or (mai hoi)). hieu va cam luc va hanh vi ((cua tre) OR (cua te))*.