Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
dien cua » dieu cua, dien cuc, dien cu
te sach » toc sach
sach da » sach dao, sach dat, sach dau
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
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 da ((nang xa) OR (lang xa)) hoi. hieu ve chat ((soc va) or (loc va)) dinh dien cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach da ((nang xa) OR (lang xa)) hoi. hieu ve chat ((soc va) OR (loc va)) dinh dien cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach da ((nang xa) OR (lang xa)) hoi. hieu ve chat ((soc va) or (loc va)) dinh dien cua te".
• Adding a wildcard symbol may retrieve word variants: te sach da ((nang xa) OR (lang xa)) hoi. hieu ve chat ((soc va) or (loc va)) dinh dien cua te*.