Perhaps you should try some spelling variations:
thien van » thi van
vat tinh » sat tinh, vat sinh, hoat tinh
lam thuc » lam thuoc, am thuc, nam thuc
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach ty)) nang x hoi. ((hieu va) or (thien van)) lam thuc vat tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. ((hieu va) OR (thien van)) lam thuc vat tinh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang x hoi. ((hieu va) or (thien van)) lam thuc vat tinh vi cua tre*.