Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
sach vay » sach va, sach hay, sach nay
hieu su » hieu sau, tieu su, hieu so
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu ve, dieu vu
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
va dau » va dao
dau vi » dau ve, dau va, dat vi
vi cua » vai cua, di 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) OR (hieu su)) cham luc va dau vi 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) OR (hieu su)) cham luc va dau vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach vay) or (sach y)) nang xa hoi. ((hieu vu) OR (hieu su)) cham luc va dau vi cua tre*.