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
dung co » dung cho, dung cong, dung cua
so sac » so sach, so dac
ve cac » va cac, vien cac
tu van » tu va
sac ky » cac ky, sai ky
ve cam » ve cham, va cam, ve cai
cua te » cua tu

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 cam) OR (ve cac)) 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 cam) OR (ve cac)) 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 cam) OR (ve cac)) 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 cam) OR (ve cac)) tu van dung co ((dua tren) or (cua te))*.