Perhaps you should try some spelling variations:
cham luc » nhan luc, cham cuu, chat lua
sach vay » sach va, sach hay, sach nay
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
va dau » va dao
dau di » da di, dau da, dau do
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach vay) OR (sach y)) nang xa hoi. hieu vu ((cham luc) OR (cham soc)) va dau di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach vay) or (sach y)) nang xa hoi. hieu vu ((cham luc) OR (cham soc)) va dau di cua tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach vay) or (sach y)) nang xa hoi. hieu vu ((cham luc) OR (cham soc)) va dau di cua tre*.