Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van ban
hang dau » hang va, hang tai
phan dau » phan tu
nang xa » nang x, lang xa, nang ma
van anh » van thanh, tuan anh, van minh
te sach » toc sach
y nang » ky nang, ly nang, v nang
vi va » vi van, vai va, vu va

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 y nang xa hoi. thien ((phan dau) OR (hang dau)) duc ((van hanh) or (van anh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. thien ((phan dau) OR (hang dau)) duc ((van hanh) OR (van anh)) vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. thien ((phan dau) OR (hang dau)) duc ((van hanh) or (van anh)) vi va triet".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. thien ((phan dau) OR (hang dau)) duc ((van hanh) or (van anh)) vi va triet*.