Perhaps you should try some spelling variations:
sach tay » xach tay, sach hay, sach tai
sach nay » sach hay, sach vay, sach nang
dinh du » dinh duc, dinh cu, dinh tu
danh di » danh du, xanh di, danh dien
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
am hoc » ad hoc
ve am » va am

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 tay) OR (sach nay)) lang xa hoi. hieu ve am hoc va ((danh di) or (dinh du)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ve am hoc va ((danh di) OR (dinh du)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tay) OR (sach nay)) lang xa hoi. hieu ve am hoc va ((danh di) or (dinh du)) cua tre*".