Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
chat cuu » chat huu, chat cua, cham cuu
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
cuu ban » cuu van, cua ban, cuu san
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (cac ky)) nang xa hoi. hieu ve chat cuu ban doanh tai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (cac ky)) nang xa hoi. hieu ve chat cuu ban doanh tai ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (cac ky)) nang xa hoi. hieu ve chat cuu ban doanh tai ((cua tre) OR (cua te))*.