Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
toc sach » hoc sach, doc sach, thuoc sach
dien cuc » dien tu, dieu cua, vien cac
va chat » van chat, va phat, cao chat
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
soc va » loc va, doc va, goc 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: toc sach y ((nang xa) or (nang x)) hoi. hieu va chat ((soc va) or (hoc va)) danh dien cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((nang xa) OR (nang x)) hoi. hieu va chat ((soc va) OR (hoc va)) danh dien cuc te.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((nang xa) or (nang x)) hoi. hieu va chat ((soc va) or (hoc va)) danh dien cuc te*.