Perhaps you should try some spelling variations:
doanh va » doan va, doanh tai, doanh cua
va doanh » van doanh, vay doanh, va danh
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, tu cach
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
su bien » su kien, su hien, su tien
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: ((tu sach) or (te sach)) ky lang xa hoi. ((hieu va) OR (lieu va)) cham luc va doanh va su bien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky lang xa hoi. ((hieu va) OR (lieu va)) cham luc va doanh va su bien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky lang xa hoi. ((hieu va) OR (lieu va)) cham luc va doanh va su bien".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky lang xa hoi. ((hieu va) OR (lieu va)) cham luc va doanh va su bien*.