Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
tay lang » tai lang, tay tang, tay quang
danh vai » danh sai, danh va, dang van
tu sach » thu sach, su sach, te sach
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac

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