Perhaps you should try some spelling variations:
thien van » thi van
cau thuc » cau truc, cuu thuc, can thuc
te sach » toc sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, 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: ((te sach) or (hoc sinh)) ky ((mang xa) or (nang ma)) hoi. thien van cau thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sinh)) ky ((mang xa) OR (nang ma)) hoi. thien van cau thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sinh)) ky ((mang xa) or (nang ma)) hoi. thien van cau thuc va hanh vi cua tre*.