Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
cham luc » cham soc, nhan luc, cham cuu
qua cham » qua hai, qua cac, va cham
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
lang ha » long ha
lang xa » dang xay, lang van
luc va » duc va, tuc va, loc va
te cac » tu cac, ve cac, te cao
te sac » te sach, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) or (te cac)) ky ((lang xa) OR (lang ha)) hoi. hieu qua cham luc va doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky ((lang xa) OR (lang ha)) hoi. hieu qua cham luc va doanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te cac)) ky ((lang xa) OR (lang ha)) hoi. hieu qua cham luc va doanh tai cua tre*".