Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham luc » cham soc, nhan luc, cham cuu
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, dai cua
bac ky » cac ky, sac ky, bac sy
ban ky » van ky, dan ky
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: te ((bac ky) OR (ban ky)) lang xa hoi. hieu qua cham luc va hanh ((tai cua) or (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((bac ky) OR (ban ky)) lang xa hoi. hieu qua cham luc va hanh ((tai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((bac ky) OR (ban ky)) lang xa hoi. hieu qua cham luc va hanh ((tai cua) or (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te ((bac ky) OR (ban ky)) lang xa hoi. hieu qua cham luc va hanh ((tai cua) or (tri cua)) tre*.