Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
lang mai » lang dai, lang hai, lang man
danh vai » danh sai, danh va, dang van
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ky lang » ky nang, ky dang, ky tang
co xuc » co xuoc, co xua
xuc va » duc va, tuc va, luc va
va co » vo co

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 (thu sach)) ky lang mai hoi. hieu va co xuc va ((danh vai) or (doanh van)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky lang mai hoi. hieu va co xuc va ((danh vai) OR (doanh van)) cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky lang mai hoi. hieu va co xuc va ((danh vai) or (doanh van)) cua viet*.