Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cam so » nam so, ham so, cam o
y nang » ky nang, ly nang, v nang
cam lo » nam lo, cam ly, cam o
va cua » va chua, via cua, ma cua
ca cua » co 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 y nang xa hoi. hieu van ((cam so) or (cam lo)) van doanh ((va cua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu van ((cam so) OR (cam lo)) van doanh ((va cua) OR (ca cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu van ((cam so) or (cam lo)) van doanh ((va cua) or (ca cua)) tre*.