Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sac » toc sach, toc san, hoc sach
ve cham » va cham, ve chat, vu cham
duc van » duc va, duc tan, duc manh
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
cua te » cua tu
x hoi » xa hoi, o hoi, x ho
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 x hoi. hieu ((ve cham) or (ve cac)) duc van hanh vi ((cua te) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky nang x hoi. hieu ((ve cham) OR (ve cac)) duc van hanh vi ((cua te) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: toc sac ky nang x hoi. hieu ((ve cham) or (ve cac)) duc van hanh vi ((cua te) or (va thiet))*.