Perhaps you should try some spelling variations:
van dung » van dong, xay dung, tin dung
dua tren » dung tren
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
dung co » dung cho, dung cong, dung cua
so sac » so sach, so dac
cua te » cua tu
cam tu » cam thu, nam tu, tam tu
sac ky » cac ky, sai ky
dam tu » nam tu, tam tu, dam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky dang xa hoi. hieu ve ((dam tu) OR (cam tu)) van dung co ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky dang xa hoi. hieu ve ((dam tu) OR (cam tu)) van dung co ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky dang xa hoi. hieu ve ((dam tu) OR (cam tu)) van dung co ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: so sac ky dang xa hoi. hieu ve ((dam tu) OR (cam tu)) van dung co ((dua tren) or (cua te))*.