Perhaps you should try some spelling variations:
dieu cua » dieu tra
dien cua » dien cuc, dien cu, tien cua
te sach » toc sach
vu cham » va cham, vu kham, tu cham
su cham » su pham, tu cham, qua cham
nang xa » nang x, lang xa, nang ma
sach 2 » sach y
soc va » hoc va, loc va, doc va
va dao » ca dao
2 nang » v 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 2 nang xa hoi. hieu ((su cham) OR (vu cham)) soc va dao ((dien cua) or (dieu cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 nang xa hoi. hieu ((su cham) OR (vu cham)) soc va dao ((dien cua) OR (dieu cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 nang xa hoi. hieu ((su cham) OR (vu cham)) soc va dao ((dien cua) or (dieu cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang xa hoi. hieu ((su cham) OR (vu cham)) soc va dao ((dien cua) or (dieu cua)) tre*.