Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
long ha » dong ha, cong ha, dong hoa
van tai » von tai, van tuan
buu tre » cuu tre
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((lang xa) or (long ha)) hoi. hieu qua cham luc va van tai buu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (long ha)) hoi. hieu qua cham luc va van tai buu tre*.