Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
thuc va » thuc vat, thuc dan, thuc day
toc sac » toc sach, toc san, hoc sach
xay hoi » xa hoi, cay phoi, gay thoi
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay
va dau » va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky dang ((xay hoi) or (tay hoi)). hieu va nam thuc va dau ((hai cua) or (hoi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky dang ((xay hoi) OR (tay hoi)). hieu va nam thuc va dau ((hai cua) OR (hoi cua)) triet.
• Adding a wildcard symbol may retrieve word variants: toc sac ky dang ((xay hoi) or (tay hoi)). hieu va nam thuc va dau ((hai cua) or (hoi cua)) triet*.