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
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
loc va » hoc va, luc va
sach v » sach va, sach y, sach 2
soc va » hoc va, doc va, goc va
v nang » va nang, vu nang, van nang

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