Perhaps you should try some spelling variations:
cham luc » cham soc, cham cuu, chat lua
dinh sai » dinh tai, danh sai, dinh hai
dang xay » dang van, van xay
nhan luc » nang luc
tu sach » thu sach, su sach, te sach
sai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet

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: tu sach y ((lang xa) OR (dang xay)) hoi. hieu ve ((cham luc) OR (nhan luc)) va dinh sai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) OR (dang xay)) hoi. hieu ve ((cham luc) or (nhan luc)) va dinh sai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) OR (dang xay)) hoi. hieu ve ((cham luc) or (nhan luc)) va dinh sai cua tre*.