Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sang tao » hang tai
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
tao hoi » tao khoi, tao boi, tay hoi
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
y sang » _ sang, duy sang

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