Perhaps you should try some spelling variations:
sach hay » sach han, sach ha, sach nay
hay lang » ha lang, tay lang, nhan lang
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
danh di » danh du, xanh di, danh dien
dinh du » dinh duc, dinh cu, dinh tu
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 hay 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 hay lang xa hoi. hieu ve am hoc va ((danh di) OR (dinh du)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach hay lang xa hoi. hieu ve am hoc va ((danh di) or (dinh du)) cua tre*.