Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
dang xay » dang van, van xay
thuc day » thuc dan, thuc vat
day vanh » day manh, day danh, day nhanh
vanh dai » van dai, vanh tai, lanh dao
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sac ky)) dang xay hoi. hieu va nham thuc day vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) dang xay hoi. hieu va nham thuc day vanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) dang xay hoi. hieu va nham thuc day vanh dai cua tre*.