Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh ha » thanh hoa, thanh hai, nhanh ha
toc sach » hoc sach, doc sach, thuoc sach
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
van cac » van hac, van cau, van bac
cac dac » cac dan, cac dai, cac bac
dac ban » cac ban, dac san, duc ban
ha cua » hoa cua, hai cua, nha 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) OR (toc sach)) ((ky tang) or (ky dang)) xa hoi. hieu van cac dac ban thanh ha cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ky tang) OR (ky dang)) xa hoi. hieu van cac dac ban thanh ha cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((ky tang) or (ky dang)) xa hoi. hieu van cac dac ban thanh ha cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((ky tang) or (ky dang)) xa hoi. hieu van cac dac ban thanh ha cua triet*.