Perhaps you should try some spelling variations:
sang tao » hang tai
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu sang » thu sang, tu san, tu lang
tao hoi » tao khoi, tao boi, tay hoi
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » va thanh, va danh, ban hanh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet

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 tu sang tao hoi. hieu vu cham duc ((va hanh) or (van hanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu sang tao hoi. hieu vu cham duc ((va hanh) OR (van hanh)) lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu sang tao hoi. hieu vu cham duc ((va hanh) or (van hanh)) lai cua tre*.