Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
dien cuc » dien tu, dieu cua, dien hoc
te sach » toc sach
va nang » van nang, da nang, cam nang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach va » sach xa, sach ha, sach dao
luc va » duc va, tuc va, loc va
soc va » hoc va, loc va, doc va

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 va nang xa hoi. hieu ve cham ((soc va) or (luc va)) danh ((dien cuc) OR (vien cac)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach va nang xa hoi. hieu ve cham ((soc va) OR (luc va)) danh ((dien cuc) OR (vien cac)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach va nang xa hoi. hieu ve cham ((soc va) or (luc va)) danh ((dien cuc) OR (vien cac)) te*".