Perhaps you should try some spelling variations:
luoc van » luoc va, luc van, luot van
luoc can » luc canh, hoc can, luoc dai
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
vi cua » di cua

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