Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thanh ha » thanh hoa, thanh hai, nhanh ha
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
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: toc sach ((ky tang) OR (ky dang)) xa hoi. hieu van cac duc tan thanh ha cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky tang) OR (ky dang)) xa hoi. hieu van cac duc tan thanh ha cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky tang) OR (ky dang)) xa hoi. hieu van cac duc tan thanh ha cua triet*.