Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh nhan
doanh ban » doanh bat, doanh nhan, doanh luan
nay thu » nam thu, tay thu, nay tu
thu xay » thau xay, thuc xay, tu xay
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va nay » va ngay, va cay

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) or (sach y)) nang ma hoi. hieu va nay thu xay ((doanh ban) OR (doanh van)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ma hoi. hieu va nay thu xay ((doanh ban) OR (doanh van)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang ma hoi. hieu va nay thu xay ((doanh ban) OR (doanh van)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach y)) nang ma hoi. hieu va nay thu xay ((doanh ban) OR (doanh van)) cua triet*.