Perhaps you should try some spelling variations:
qua cham » qua hai, va cham, qua cua
qua cac » cua cac
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
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 ((qua cham) OR (qua cac)) luc 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 ((qua cham) OR (qua cac)) luc va dan vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) dang xa hoi. hieu ((qua cham) OR (qua cac)) luc va dan vi cua tre*.