Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cac luc » cau luc, coc luc, cac nuoc
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, nang ma
co cua » con cua, ca cua, cong cua
san ky » sang ky, van ky, ban ky
dan ky » van ky
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 ((san ky) or (dan ky)) nang xa hoi. hieu vien cac luc ((va danh) OR (va dinh)) co cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dan ky)) nang xa hoi. hieu vien cac luc ((va danh) OR (va dinh)) co cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) or (dan ky)) nang xa hoi. hieu vien cac luc ((va danh) OR (va dinh)) co cua su".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) or (dan ky)) nang xa hoi. hieu vien cac luc ((va danh) OR (va dinh)) co cua su*.