Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
bien cac » vien cac, dien cac, bien ca
nien cac » vien cac, dien cac, hien cac
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vu sach » vu bach, vu khach
toc van » hoc van, toc san, tac van
su sach » so sach
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) ty nang xa hoi. thieu ((nien cac) or (bien cac)) toc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty nang xa hoi. thieu ((nien cac) OR (bien cac)) toc van hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty nang xa hoi. thieu ((nien cac) or (bien cac)) toc van hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty nang xa hoi. thieu ((nien cac) or (bien cac)) toc van hanh vi su triet*.