Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
than cua » nhan cua, thai cua, ban cua
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
duc van » duc va, duc tan, duc manh
su sai » su tai, su hai, su dai
sai ky » sac ky
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky dang xa hoi. hieu ((ve cao) OR (va cao)) duc van hanh ((than cua) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky dang xa hoi. hieu ((ve cao) OR (va cao)) duc van hanh ((than cua) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky dang xa hoi. hieu ((ve cao) OR (va cao)) duc van hanh ((than cua) or (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky dang xa hoi. hieu ((ve cao) OR (va cao)) duc van hanh ((than cua) or (tai cuc)) tre*.