Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
doanh vi » doanh va, doan vi, doanh vien
lang van » dang van, tang van, hoang van
van hieu » cao hieu
cham cuu » cap cuu, chat cua
tu sach » thu sach, su sach, te sach
cam cuu » cap cuu
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
ky lang » ky nang, ky dang, ky tang
vi cua » vai cua, di cua

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 ky lang van hieu. ((hieu ve) or (hieu va)) ((cam cuu) or (cham cuu)) ban doanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang van hieu. ((hieu ve) OR (hieu va)) ((cam cuu) OR (cham cuu)) ban doanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang van hieu. ((hieu ve) or (hieu va)) ((cam cuu) or (cham cuu)) ban doanh vi cua tre*.