Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thuoc vat » thuc vat, thuoc va, thuoc bat
vat hanh » vat thanh, van hanh, va hanh
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
cua te » cua tu
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: vu sach ky ((lang van) or (tang van)) hoi. hieu va nam thuoc vat hanh vi ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((lang van) OR (tang van)) hoi. hieu va nam thuoc vat hanh vi ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((lang van) or (tang van)) hoi. hieu va nam thuoc vat hanh vi ((cua te) or (cuu tre))*.