Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
dien cuc » dien tu, dieu cua, vien cac
te sach » toc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
sach v » sach va, sach y, sach 2
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
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 v ((nang xa) OR (lang xa)) hoi. hieu va cham ((soc va) or (loc va)) danh dien cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v ((nang xa) OR (lang xa)) hoi. hieu va cham ((soc va) OR (loc va)) danh dien cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v ((nang xa) OR (lang xa)) hoi. hieu va cham ((soc va) or (loc va)) danh dien cuc te".
• Adding a wildcard symbol may retrieve word variants: te sach v ((nang xa) OR (lang xa)) hoi. hieu va cham ((soc va) or (loc va)) danh dien cuc te*.