Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, xuc ban
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
vai cua » dai cua, hai cua, lai cua
di cua » dai cua, doi cua, de cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac

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 xa hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh ((di cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xa hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh ((di cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xa hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh ((di cua) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xa hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh ((di cua) or (vai cua)) tre*.