Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
luc va » duc va, tuc va, loc va
ma hoi » xa hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao

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

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