Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((dang xay) or (tang van)) hoi. hieu van nam thuc day hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((dang xay) OR (tang van)) hoi. hieu van nam thuc day hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((dang xay) or (tang van)) hoi. hieu van nam thuc day hanh vi cua tre*.