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