Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
thu sach » tu sach, thuat sach, thuoc sach
ly doanh » ly anh
mai viet » thi viet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
va cau » van cau, va cac, va dau
va mai » va bai, va moi, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu va cau luc ((van doanh) or (ly doanh)) va mai viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu va cau luc ((van doanh) OR (ly doanh)) va mai viet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu va cau luc ((van doanh) or (ly doanh)) va mai viet*.