Perhaps you should try some spelling variations:
sang tao » hang tai
ca viet » va viet, co viet, san viet
va hanh » van hanh, va thanh, va danh
hieu le » hieu ve, hieu he, hieu ly
sach ky » sach y, sach ty, sach kem
tao hoi » tao khoi, tao boi, tay hoi
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na
thu va » thuc va, thue va, tu 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) or (sac ky)) sang tao hoi. hieu le nam thu va hanh vi ((ca viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) sang tao hoi. hieu le nam thu va hanh vi ((ca viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) sang tao hoi. hieu le nam thu va hanh vi ((ca viet) or (hoa viet))*.