Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
dang xay » dang van, van xay
sach ha » sach nha, sach han, sach xa
lang xa » lang ha, lang van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
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: toc ((sach v) or (sach ha)) ((lang xa) OR (dang xay)) hoi. lieu va cau thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach v) OR (sach ha)) ((lang xa) OR (dang xay)) hoi. lieu va cau thuc va hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach v) or (sach ha)) ((lang xa) OR (dang xay)) hoi. lieu va cau thuc va hanh vi cua tre*".