Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
dien cuc » dien tu, dieu cua, vien cac
toc sach » hoc sach, doc sach, thuoc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
nang xa » nang x, lang xa, nang ma
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
v nang » va nang, vu nang, van nang
cuc te » cua te, cuc thue, cuc tieu

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) or (toc sach)) v nang xa hoi. hieu va cham ((soc va) OR (doc va)) dinh dien cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang xa hoi. hieu va cham ((soc va) OR (doc va)) dinh dien cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) v nang xa hoi. hieu va cham ((soc va) OR (doc va)) dinh dien cuc te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) v nang xa hoi. hieu va cham ((soc va) OR (doc va)) dinh dien cuc te*.