Perhaps you should try some spelling variations:
sang tao » hang tai
nam thuc » nam thuoc, nam thu, nam tu
cua viet » ca viet, cua vat, cua dieu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
tao hoi » tao khoi, tao boi, tay hoi
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh

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 tao hoi. hieu ve ((nam thuc) or (am thuc)) va hanh vi ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang tao hoi. hieu ve ((nam thuc) OR (am thuc)) va hanh vi ((cua viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky sang tao hoi. hieu ve ((nam thuc) or (am thuc)) va hanh vi ((cua viet) or (hoa viet))*.