Perhaps you should try some spelling variations:
su triet » su viet, ve triet
hanh cao » hanh cac, hanh cat, hanh cad
sang tao » hang tai
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, mang may
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc 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 ((sang ma) OR (sang tao)) hoi. hieu va cam luc va hanh cao ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((sang ma) OR (sang tao)) hoi. hieu va cam luc va hanh cao ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((sang ma) OR (sang tao)) hoi. hieu va cam luc va hanh cao ((su triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((sang ma) OR (sang tao)) hoi. hieu va cam luc va hanh cao ((su triet) or (su tien))*.