Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thanh va » thanh van, hanh va, thanh ha
kho tang » cao tang
van bao » van ban, van dao
duc ban » duc tan, duc van, dua ban
te sach » toc sach
ky tang » ky nang, ky dang, ky trong
van bac » van ban, van hac, dan bac
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ky tang) or (kho tang)) xa hoi. hieu ((van bac) OR (van bao)) duc ban thanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (kho tang)) xa hoi. hieu ((van bac) OR (van bao)) duc ban thanh va cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky tang) or (kho tang)) xa hoi. hieu ((van bac) OR (van bao)) duc ban thanh va cua triet*".