Perhaps you should try some spelling variations:
gianh dai » gianh lai, gian dan, giang day
sach kho » bach khoa, sach dao, sach nha
va gianh » va gian, van giang, va giai
dang xay » dang van, van xay
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
cac duc » cac du, cac dac, cac nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach kho ((lang xa) OR (dang xay)) hoi. hieu ve ((cac duc) or (cao duc)) va gianh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach kho ((lang xa) OR (dang xay)) hoi. hieu ve ((cac duc) OR (cao duc)) va gianh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach kho ((lang xa) OR (dang xay)) hoi. hieu ve ((cac duc) or (cao duc)) va gianh dai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach kho ((lang xa) OR (dang xay)) hoi. hieu ve ((cac duc) or (cao duc)) va gianh dai cua te*.