Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh loi » thanh hoa, thanh hai, thanh lap
vat thanh » dat thanh, gat thanh, tat thanh
thuoc vat » thuc vat, thuoc va, thuoc bat
nam thuoc » nam thuc, nam thu, nha thuoc
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, dang xay
cua tre » cua te, cuu tre, dua tren
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 ((mang xa) or (nang x)) hoi. hieu va nam thuoc vat thanh loi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((mang xa) OR (nang x)) hoi. hieu va nam thuoc vat thanh loi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((mang xa) or (nang x)) hoi. hieu va nam thuoc vat thanh loi ((cua tre) or (cua triet))*.