Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham loc » cham soc, chon loc, cham o
cua tre » cua te, cuu tre, dua tren
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
va cham » va chat, va tham
sac ky » cac ky, sai ky
loc va » hoc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sac ky)) dang xa hoi. hieu va cham loc va dan vi ((cua tre) OR (cua triet))~.
• 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 loc va dan vi ((cua tre) OR (cua triet)).
• 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 loc va dan vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) dang xa hoi. hieu va cham loc va dan vi ((cua tre) OR (cua triet))*.