Perhaps you should try some spelling variations:
sang tao » hang tai
van hanh » van thanh, ban hanh, van ban
tu sach » thu sach, su sach, te sach
sach vu » sach va, sach tu, sach uu
vu sang » vua sang, vu dang, vu san
tao hoi » tao khoi, tao boi, tay hoi
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
van anh » van thanh, tuan anh, van minh
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
ki su » ky su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach vu sang tao hoi. hieu va cam duc ((van hanh) or (van anh)) ki su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu sang tao hoi. hieu va cam duc ((van hanh) OR (van anh)) ki su tien.
• Adding a wildcard symbol may retrieve word variants: tu sach vu sang tao hoi. hieu va cam duc ((van hanh) or (van anh)) ki su tien*.