Perhaps you should try some spelling variations:
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cac » vien cac
xuc va » duc va, tuc va, luc 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 ((ve cac) OR (va cac)) xuc va hanh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu ((ve cac) OR (va cac)) xuc va hanh vi ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu ((ve cac) OR (va cac)) xuc va hanh vi ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu ((ve cac) OR (va cac)) xuc va hanh vi ((dua tren) or (cuu tre))*.