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
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
lo toan » lo tan, le toan, ly toan
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo

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