Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
ky dang » ky nang
ky danh » ky anh
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
cua te » cua tu
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ((ky dang) or (ky danh)) xa hoi. hieu vien cac nuoc va hanh vi ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky dang) OR (ky danh)) xa hoi. hieu vien cac nuoc va hanh vi ((cua te) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky dang) or (ky danh)) xa hoi. hieu vien cac nuoc va hanh vi ((cua te) or (cua su))*.