Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet
thanh di » thanh doi, thanh de, thanh do
va triet » va thiet, va trien, ve triet
vu sach » vu bach, su sach, vu khach
co sach » bo sach, cuon sach, hoc sach
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
toc van » hoc van, toc san, tac van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (co sach)) ky nang x ho. hieu va cac toc van thanh di ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (co sach)) ky nang x ho. hieu va cac toc van thanh di ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (co sach)) ky nang x ho. hieu va cac toc van thanh di ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (co sach)) ky nang x ho. hieu va cac toc van thanh di ((cua triet) OR (va triet))*.