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