Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
cua triet » cua viet, su triet
doanh van » doan van, doanh va, doanh ban
va triet » va thiet, va trien, ve triet
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cac tac » cac toc, cac bac, cac dac
hieu ve » hieu va, hieu van
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
tac vay » tac va, tac van, tac cay
ve cac » va cac, vien cac
ha hoi » hoa hoi, ha noi, xa hoi

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 ha hoi. hieu ve cac tac vay doanh van ((cua tre) or (((cua triet) OR (va triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ha hoi. hieu ve cac tac vay doanh van ((cua tre) OR (((cua triet) OR (va triet))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ha hoi. hieu ve cac tac vay doanh van ((cua tre) or (((cua triet) OR (va triet))))*".