Perhaps you should try some spelling variations:
doanh cua » doanh luan
ve triet » va trien, su triet
sach ky » sac ky, sach ty, sach kem
danh ca » dan ca, danh cho, danh gia
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
cam luc » cam xuc, cau luc
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach y)) nang cao hoi. hieu ve cam luc va ((danh ca) OR (doanh cua)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang cao hoi. hieu ve cam luc va ((danh ca) OR (doanh cua)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) nang cao hoi. hieu ve cam luc va ((danh ca) OR (doanh cua)) ve triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) nang cao hoi. hieu ve cam luc va ((danh ca) OR (doanh cua)) ve triet*.