Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh doi » thanh loi, thanh moi, thanh do
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay

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 ky ((nang xa) or (nang x)) hoi. hieu va nam thuc vat thanh doi ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang xa) OR (nang x)) hoi. hieu va nam thuc vat thanh doi ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang xa) or (nang x)) hoi. hieu va nam thuc vat thanh doi ((cuu tre) or (cua triet))*.