Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
tan thanh » tran thanh, tang thanh, toan thanh
va triet » va thiet, va trien, ve triet
thanh ha » thanh hoa, thanh hai, nhanh ha
hieu van » hieu va, thien van, lieu va
cac duc » cac du, cao duc, cac dac
te sach » toc sach
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
van cac » van hac, van cau, van bac

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 (ky dang)) xa hoi. hieu van cac duc tan thanh ha ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky dang)) xa hoi. hieu van cac duc tan thanh ha ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky tang) or (ky dang)) xa hoi. hieu van cac duc tan thanh ha ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky tang) or (ky dang)) xa hoi. hieu van cac duc tan thanh ha ((cua triet) OR (va triet))*.