Perhaps you should try some spelling variations:
doanh van » doanh va, doanh ban, doanh nhan
cua triet » cua viet, su triet, va triet
doan van » doan va, hoang van, luan van
cac truc » cau truc, cac tru, cac trung
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
truc va » thuc va, thuc vat, trung va
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: te sach ky dang xa hoi. hieu ve cac truc va ((doanh van) or (doan van)) ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xa hoi. hieu ve cac truc va ((doanh van) OR (doan van)) ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xa hoi. hieu ve cac truc va ((doanh van) or (doan van)) ((cua tre) OR (cua triet))*".