Perhaps you should try some spelling variations:
vao triet » va triet, mao triet, va trien
van hanh » van thanh, ban hanh, van anh
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
va hanh » va thanh, va danh, ban hanh
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
ve ca » ve cai, ve cau, ve cua

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