Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
ve ca » ve cai, ve cau, ve cua
thiet » thieu

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)) tao va hanh di ((va triet) or (va thiet))~.
• 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)) tao va hanh di ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: toc sac ky nang xa hoi. hieu ((ve ca) or (ve cac)) tao va hanh di ((va triet) or (va thiet))*.