Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham cuu » cap cuu, chat cua
kho tang » cao tang
doan vi » don vi, doan thi, doan van
cuu ban » cuu van, cua ban, cuu san
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
ve cham » va cham, ve chat, vu cham

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 tang) or (kho tang)) van hoa. hieu ve cham cuu ban ((doan vi) OR (doan va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (kho tang)) van hoa. hieu ve cham cuu ban ((doan vi) OR (doan va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky tang) or (kho tang)) van hoa. hieu ve cham cuu ban ((doan vi) OR (doan va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (kho tang)) van hoa. hieu ve cham cuu ban ((doan vi) OR (doan va)) cua triet*.