Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh ban
sach hoi » sach doi, sach moi, cach thoi
danh vai » danh sai, danh va, dang van
cam luc » cam xuc, cau luc
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
lang ha » long ha
luc va » duc va, tuc va, loc va
ve cam » ve cham, ve cac, va cam

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

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