Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu sach » thuat sach, thuoc sach, thu hoach
ky doanh » ly doanh, ky danh, ty doanh
tu sach » su sach, te sach, tu cach
cac tuc » cac toc, cac tu, cac tac
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
hieu va » hieu qua
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
cua te » cua tu

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 doanh van hoa. ((hieu va) or (lieu va)) cac tuc va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky doanh van hoa. ((hieu va) OR (lieu va)) cac tuc va danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky doanh van hoa. ((hieu va) or (lieu va)) cac tuc va danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky doanh van hoa. ((hieu va) or (lieu va)) cac tuc va danh vi cua te*.