Perhaps you should try some spelling variations:
te sach » toc sach
dan tai » van tai, dan thi, han tai
dan sai » danh sai, doan sai, dan giai
thu nam » tu nam, thu nhap, thu nhat
cua tre » cua te, cuu tre, cua triet
hieu he » hieu ve, hiem he, hieu le
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
he nam » ha nam, nghe nam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (sang ma)) hoi. hieu he nam thu nam ((dan sai) OR (dan tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ma) or (sang ma)) hoi. hieu he nam thu nam ((dan sai) OR (dan tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (sang ma)) hoi. hieu he nam thu nam ((dan sai) OR (dan tai)) cua tre*.