Perhaps you should try some spelling variations:
thien van » thi van
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van ban
van anh » van thanh, tuan anh, van minh
dau duc » dao duc, dang duc, dau nuoc
te sach » toc sach
van dau » van dao, phan dau
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van 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) or (v nang)) xa hoi. thien van 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) OR (v nang)) xa hoi. thien van 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) or (v nang)) xa hoi. thien van dau duc ((van hanh) OR (van anh)) vi va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) xa hoi. thien van dau duc ((van hanh) OR (van anh)) vi va triet*.