Perhaps you should try some spelling variations:
cham doc » cham soc, chat doc, chau doc
sang tao » hang tai
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
va hanh » va thanh, va danh, dao hanh
tai cua » thai cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tao hoi » tao khoi, tao boi, tay hoi
ty sang » ty xang, ty hang, duy sang
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 ty sang tao hoi. hieu vu cham doc ((((va hanh) OR (ban hanh))) or (van hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty sang tao hoi. hieu vu cham doc ((((va hanh) OR (ban hanh))) OR (van hanh)) tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty sang tao hoi. hieu vu cham doc ((((va hanh) OR (ban hanh))) or (van hanh)) tai cua tre*".