Perhaps you should try some spelling variations:
thanh vi » thanh va, thanh ve, nhanh vi
cam thuc » am thuc, nam thuc, cam thu
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly ((nang xa) or (nang x)) hoi. hieu ve cam thuc vat ((thanh vi) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly ((nang xa) OR (nang x)) hoi. hieu ve cam thuc vat ((thanh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ly ((nang xa) or (nang x)) hoi. hieu ve cam thuc vat ((thanh vi) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ly ((nang xa) or (nang x)) hoi. hieu ve cam thuc vat ((thanh vi) OR (hanh vi)) cua tre*.