Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
nay thuc » nam thuc, cay thuc, day thuc
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
vu sach » vu bach, vu khach
su sach » so sach
cua tre » cua te, cuu tre, cua triet
va nay » va ngay, va cay
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) or (su sach)) ky ((dang xay) or (tang van)) hoi. hieu va nay thuc dan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky ((dang xay) OR (tang van)) hoi. hieu va nay thuc dan hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky ((dang xay) or (tang van)) hoi. hieu va nay thuc dan hanh vi cua tre*.