Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
xay hoi » xa hoi, cay phoi, gay thoi
hoi cua » hoi chuc
vai cua » dai cua, hai cua, lai cua
tay hoi » tay ho, tao hoi, tay thai
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
thuc va » thuc vat, thuc dan, thuc day
san ky » sang ky, van ky, dan ky
va dau » va dao
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 san ky dang ((xay hoi) or (tay hoi)). hieu va nam thuc va dau ((vai cua) or (hoi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ky dang ((xay hoi) OR (tay hoi)). hieu va nam thuc va dau ((vai cua) OR (hoi cua)) triet.
• Adding a wildcard symbol may retrieve word variants: toc san ky dang ((xay hoi) or (tay hoi)). hieu va nam thuc va dau ((vai cua) or (hoi cua)) triet*.