Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, chat lua
cham cuu » cap cuu, chat cua
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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: tu ((sach y) OR (sac ky)) dang xa hoi. hieu va ((cham luc) OR (cham cuu)) va dan vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach y) or (sac ky)) dang xa hoi. hieu va ((cham luc) OR (cham cuu)) va dan vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) dang xa hoi. hieu va ((cham luc) OR (cham cuu)) va dan vi cua tre*.