Perhaps you should try some spelling variations:
dien cua » dieu cua, dien cuc, dien cu
dien cuu » dien cuc, dien cu, dien chu
te sach » toc sach
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
lang xa » lang ha, dang xay, lang van
soc va » hoc va, loc va, goc va
sach 2 » sach y
doc va » duoc va, hoc va, duc va
2 lang » 22 lang, o lang, _ lang

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 lang xa hoi. hieu su cham ((soc va) OR (doc va)) dan ((dien cuu) or (dien cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 lang xa hoi. hieu su cham ((soc va) OR (doc va)) dan ((dien cuu) OR (dien cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 lang xa hoi. hieu su cham ((soc va) OR (doc va)) dan ((dien cuu) or (dien cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach 2 lang xa hoi. hieu su cham ((soc va) OR (doc va)) dan ((dien cuu) or (dien cua)) tre*.