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
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
lang ha » long ha
lang xa » dang xay, lang van
va cam » va cham, va cac, va cao

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

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