Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
vay doanh » van doanh, ly doanh, voi doanh
hieu luc » hieu luat, hieu qua
cham xuc » cam xuc, chat xuc, cham soc
hieu tuc » hieu thuc, hieu thuoc, lieu thuc
tu sach » thu sach, su sach, tu cach
xuc vay » xuc hay
va viet » hoa viet, san viet, mai viet
te sach » toc sach
van va » van vat, van van, ban va
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) or (te sach)) ky nang x hoi. ((hieu tuc) OR (hieu luc)) cham xuc vay doanh van va viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. ((hieu tuc) OR (hieu luc)) cham xuc vay doanh van va viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang x hoi. ((hieu tuc) OR (hieu luc)) cham xuc vay doanh van va viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang x hoi. ((hieu tuc) OR (hieu luc)) cham xuc vay doanh van va viet*.