Perhaps you should try some spelling variations:
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
nay thuc » nam thuc, cay thuc, day thuc
tang van » dang van, hoang van, trong van
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
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 ((lang xa) or (tang van)) hoi. ((hieu va) OR (hieu qua)) nay thuc day hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((lang xa) OR (tang van)) hoi. ((hieu va) OR (hieu qua)) nay thuc day hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((lang xa) or (tang van)) hoi. ((hieu va) OR (hieu qua)) nay thuc day hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((lang xa) or (tang van)) hoi. ((hieu va) OR (hieu qua)) nay thuc day hanh vi cua tre*.