Perhaps you should try some spelling variations:
thien van » thi van
vat tinh » sat tinh, vat sinh, hoat tinh
nam thuc » nam thuoc, am thuc, nam thu
sach ty » sach y, sach thu, xach tay
tinh ca » tinh cao, tinh cua, tinh va
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
sach tu » sach thu, cach tu, sach uu
ca cua » co cua

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 ty) or (sach tu)) ((nang xa) or (nang x)) hoi. thien van nam thuc vat tinh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) ((nang xa) OR (nang x)) hoi. thien van nam thuc vat tinh ca cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) ((nang xa) or (nang x)) hoi. thien van nam thuc vat tinh ca cua tre*.