Perhaps you should try some spelling variations:
doanh vai » doanh tai, doanh va, doanh van
viec cac » vien cac, viec lam, viec va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
lo toan » lo tan, le toan, ly toan
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. hieu ((viec cac) or (viec cua)) lo toan doanh vai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ((viec cac) OR (viec cua)) lo toan doanh vai ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu ((viec cac) or (viec cua)) lo toan doanh vai ((cuu tre) OR (cua tre))*".