Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
dieu cua » dieu tra
te sach » toc sach
nang xa » nang x, lang xa, nang ma
chat so » nhat so, chat co, chat bo
va dinh » van dinh, va kinh, va tinh
dien cu » dien cuc, dien cua, dien cac
sach 2 » sach y
2 nang » v nang
so va » so van, so vat, su 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 2 nang xa hoi. hieu van chat so va dinh ((dieu cua) or (((dien cu) OR (dien tu)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 nang xa hoi. hieu van chat so va dinh ((dieu cua) OR (((dien cu) OR (dien tu)))) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 nang xa hoi. hieu van chat so va dinh ((dieu cua) or (((dien cu) OR (dien tu)))) tre".
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang xa hoi. hieu van chat so va dinh ((dieu cua) or (((dien cu) OR (dien tu)))) tre*.