Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
vi cua » vai 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 nang ((ma hoi) OR (xa hoi)). hieu ((ve cam) or (va cam)) luc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cam) OR (va cam)) luc va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cam) or (va cam)) luc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) OR (xa hoi)). hieu ((ve cam) or (va cam)) luc va hanh vi cua vat*.