Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu san » thuy san, thu ban, phu san
nang xa » nang x, lang xa, nang ma
doi cua » dai cua, hoi cua, dong cua
va danh » va dinh, va dan, va hanh
va cao » va cac, va co, va dao
san ky » sang ky, van ky, dan ky
ve cao » ve bao, ve cac, ve co
cua tu » cua tuc, cua su, cua cu

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

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