Perhaps you should try some spelling variations:
dinh viet » ninh viet, danh viet, trinh viet
toc sach » hoc sach, doc sach, thuoc sach
viet cua » viec cua, viet ca, viet qua
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
y sang » _ sang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
dac va » duc va, day va, dai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y sang ma hoi. hieu ve cac ((dac va) or (dat va)) dinh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y sang ma hoi. hieu ve cac ((dac va) OR (dat va)) dinh viet cua tre*.