Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
de doanh » te doanh, dao doanh, doi doanh
ve doanh » va doanh, te doanh, van doanh
cham cuu » cap cuu, chat cua
thu sach » tu sach, thuat sach, thuoc sach
hieu vu » hieu va, hieu ve, hieu su
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
tai cua » thai cua, tai cuc, tri cua
vu cham » va cham, vu kham, tu cham

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang xa) or (nang x)) hoi. hieu vu cham cuu ((ve doanh) OR (de doanh)) tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang x)) hoi. hieu vu cham cuu ((ve doanh) OR (de doanh)) tai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (nang x)) hoi. hieu vu cham cuu ((ve doanh) OR (de doanh)) tai cua triet*".