Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
su triet » su viet, su tien, ve triet
hien cac » thien cac, vien cac, hieu cac
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
dinh va » dinh van, dinh ve, tinh va
tu sac » tu sach, tu cac, tu san
bao va » bao ve, tao va, ban va
sac ky » cac ky, sai ky
lao va » tao va, cao va, dao va

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 nang xa hoi. hieu hien cac ((lao va) or (bao va)) dinh va ((dua tren) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu hien cac ((lao va) OR (bao va)) dinh va ((dua tren) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu hien cac ((lao va) or (bao va)) dinh va ((dua tren) or (su triet))*.