Perhaps you should try some spelling variations:
su triet » su viet, 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
dinh ve » dinh ket, dinh van
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
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: su sach ky nang ma hoa. hieu va cam xuc va ((hanh vi) or (dinh ve)) ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoa. hieu va cam xuc va ((hanh vi) OR (dinh ve)) ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoa. hieu va cam xuc va ((hanh vi) or (dinh ve)) ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoa. hieu va cam xuc va ((hanh vi) or (dinh ve)) ((su triet) OR (su tien))*.