Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
ban hanh » ban hang
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
ma hoi » mai hoi, xa hoi, ma hoa

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. hieu va cac duc ((ban hanh) or (van minh)) vi ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu va cac duc ((ban hanh) OR (van minh)) vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu va cac duc ((ban hanh) or (van minh)) vi ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu va cac duc ((ban hanh) or (van minh)) vi ((cua triet) OR (va triet))*.