Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
khoa hoi » khoan hoi, khoa doi, khoa noi
khoa hoc » hoa hoc
thu van » thuc van, thuy van, tu van
hieu le » hieu ve, hieu he, hieu ly
ky lang » ky nang, ky dang, ky tang
le nam » ly nam, he nam, le na
sac ky » cac ky, sai ky
van su » dan su
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang ((khoa hoi) OR (khoa hoc)). hieu le nam thu van thanh ((van su) or (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ((khoa hoi) OR (khoa hoc)). hieu le nam thu van thanh ((van su) OR (va su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang ((khoa hoi) OR (khoa hoc)). hieu le nam thu van thanh ((van su) or (va su)) triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ((khoa hoi) OR (khoa hoc)). hieu le nam thu van thanh ((van su) or (va su)) triet*.