Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua dieu
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
so sac » so sach, so dac
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky tang ((ma hoi) or (xa hoi)). hieu ve cam duc va hanh vi ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky tang ((ma hoi) OR (xa hoi)). hieu ve cam duc va hanh vi ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: so sac ky tang ((ma hoi) or (xa hoi)). hieu ve cam duc va hanh vi ((cua viet) or (cua vat))*.