Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
vanh dai » van dai, vanh tai, lanh dao
sach ky » sach y, sach ty, sach kem
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
thuc va » thuc vat, thuc dan, thuc day
va vanh » va van, va danh, va hanh
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 ky) OR (sac ky)) dang xa hoi. hieu va nham thuc va vanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) dang xa hoi. hieu va nham thuc va vanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) dang xa hoi. hieu va nham thuc va vanh dai cua tre*.