Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
nhan luc » nang luc
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
hieu ve » hieu van
sach ky » sac ky, sach ty, sach kem
luc va » duc va, tuc va, loc va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach y)) nang x hoi. ((hieu ve) OR (hieu va)) nhan luc va doanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang x hoi. ((hieu ve) OR (hieu va)) nhan luc va doanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang x hoi. ((hieu ve) OR (hieu va)) nhan luc va doanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang x hoi. ((hieu ve) OR (hieu va)) nhan luc va doanh tai cua te*.