Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh va, hanh tai, hanh van
dang xay » dang van, van xay
thuc ban » thuoc ban, thuc dan, thu ban
hieu va » hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
san ky » sang ky, van ky, dan ky
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky dang xay hoi. ((hieu va) or (lieu va)) nham thuc ban ((hanh vai) or (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky dang xay hoi. ((hieu va) OR (lieu va)) nham thuc ban ((hanh vai) OR (hanh vi)) cua viet.
• Adding a wildcard symbol may retrieve word variants: tu san ky dang xay hoi. ((hieu va) or (lieu va)) nham thuc ban ((hanh vai) or (hanh vi)) cua viet*.