Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
viet cua » viec cua, viet ca, viet qua
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, tu cach
thuc va » thuc vat, thuc dan
cua tre » cua te, cuu tre, cua triet
hieu ke » hieu kem, chieu ke, hieu ky
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
ke cau » ket cau

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) or (te sach)) ky lang xa hoi. hieu ke cau ((thuc va) or (thuc day)) dinh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky lang xa hoi. hieu ke cau ((thuc va) OR (thuc day)) dinh viet cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky lang xa hoi. hieu ke cau ((thuc va) or (thuc day)) dinh viet cua tre*.