Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
x hoi » o hoi, x ho, 5 hoi

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 ly nang ((x hoi) OR (xa hoi)). hieu ve ((nam thuc) or (nam thuoc)) va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly nang ((x hoi) OR (xa hoi)). hieu ve ((nam thuc) OR (nam thuoc)) va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ly nang ((x hoi) OR (xa hoi)). hieu ve ((nam thuc) or (nam thuoc)) va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ly nang ((x hoi) OR (xa hoi)). hieu ve ((nam thuc) or (nam thuoc)) va hanh vi cuu tre*.