Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh ban
danh vai » danh sai, danh va, dang van
cam duc » cam xuc, cao duc, pham duc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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 lang xa hoi. ((hieu va) OR (hieu qua)) cam duc va ((danh vai) or (doanh van)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu va) OR (hieu qua)) cam duc va ((danh vai) OR (doanh van)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu va) OR (hieu qua)) cam duc va ((danh vai) or (doanh van)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((hieu va) OR (hieu qua)) cam duc va ((danh vai) or (doanh van)) cua triet*.