Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
sach thu » sach thue, sach thieu, sach tham
cau thuc » cau truc, cuu thuc, can thuc
lieu van » lieu va, hieu van, sieu van
xach tay » canh tay
van cau » van dau, van hau, van chat
mang xa » lang xa, mang may, dang xay
cua tre » cua te, cuu tre, cua triet
xang xa » lang xa, ang xa, dang xay
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: su ((xach tay) or (sach thu)) ((xang xa) OR (mang xa)) hoi. lieu van cau thuc dan hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((xach tay) OR (sach thu)) ((xang xa) OR (mang xa)) hoi. lieu van cau thuc dan hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((xach tay) or (sach thu)) ((xang xa) OR (mang xa)) hoi. lieu van cau thuc dan hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((xach tay) or (sach thu)) ((xang xa) OR (mang xa)) hoi. lieu van cau thuc dan hanh vi cua tre*.