Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
toc sac » toc sach, hoc sach, doc sach
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
do van » dao van, vo van, so van
ve ca » ve cai, ve cau, ve cua
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sac) OR (toc san)) ky nang xa hoi. hieu ((ve ca) or (ve cac)) do van hanh di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (toc san)) ky nang xa hoi. hieu ((ve ca) OR (ve cac)) do van hanh di va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (toc san)) ky nang xa hoi. hieu ((ve ca) or (ve cac)) do van hanh di va triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (toc san)) ky nang xa hoi. hieu ((ve ca) or (ve cac)) do van hanh di va triet*.