Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua viet » ca viet, hoa viet, cua vat
cham tuc » nham thuc, pham thuc, tham thuc
va doanh » van doanh, vay doanh, va danh
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
te sach » toc sach
van cua » vang cua, ban cua, dan cua
tu sach » thu sach, su sach, tu cach
tuc va » thuc va, truc va, tuc xa

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) OR (ky nang)) xa hoi. hieu va cham tuc va doanh van cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ((ky lang) OR (ky nang)) xa hoi. hieu va cham tuc va doanh van cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ((ky lang) OR (ky nang)) xa hoi. hieu va cham tuc va doanh van cua viet*".