Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
nien coc » nien cong, dien cuc, dien cac
nang xa » nang x, lang xa, nang ma
te sach » toc sach
luc van » luoc van, luu van, duc van
te sac » te cac, te san
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 sac) or (te sach)) ky nang xa hoi. thieu ((nien coc) OR (vien cac)) luc van hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky nang xa hoi. thieu ((nien coc) OR (vien cac)) luc van hanh vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te sach)) ky nang xa hoi. thieu ((nien coc) OR (vien cac)) luc van hanh vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te sach)) ky nang xa hoi. thieu ((nien coc) OR (vien cac)) luc van hanh vi va triet*.