Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sang tao » hang tai
hieu van » hieu va, thien van, lieu va
phan duc » pham duc, phan dau, tran duc
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
tao hoi » tao khoi, tao boi, tay hoi
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 ((phan duc) or (phan tu)) ((van hanh) or (va danh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang tao hoi. hieu van ((phan duc) OR (phan tu)) ((van hanh) OR (va danh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y sang tao hoi. hieu van ((phan duc) or (phan tu)) ((van hanh) or (va danh)) hai cua tre*.