Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cham luc » cham soc, nhan luc, cham cuu
sach nay » sach hay, sach vay, sach nang
hieu ve » hieu va, hieu van
hieu vu » hieu va, hieu su, dieu vu
lang xa » lang ha, dang xay, lang van
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 nay) OR (sach y)) lang xa hoi. ((hieu vu) OR (hieu ve)) cham luc va dau vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach nay) or (sach y)) lang xa hoi. ((hieu vu) OR (hieu ve)) cham luc va dau vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: te ((sach nay) or (sach y)) lang xa hoi. ((hieu vu) OR (hieu ve)) cham luc va dau vi cua viet*.