Perhaps you should try some spelling variations:
dang nhiet » dang nhat, dang viet, dan thiet
tham thuc » nham thuc, pham thuc, tam thuc
dinh kien » linh kien, dinh dien, dinh ket
doc sac » doc sach, dac sac, hoc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
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: doc sac ky lang xa hoi. hieu va tham thuc va ((dang nhiet) or (dinh kien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sac ky lang xa hoi. hieu va tham thuc va ((dang nhiet) OR (dinh kien)) cua tre.
• Adding a wildcard symbol may retrieve word variants: doc sac ky lang xa hoi. hieu va tham thuc va ((dang nhiet) or (dinh kien)) cua tre*.