Perhaps you should try some spelling variations:
va danh » va dinh, va dan, dia danh
nang xa » nang x, nang ma, mang xa
va hanh » van hanh, va thanh, ban hanh
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
tu san » thu san, tu ban, tu can
vi cua » vai cua, di cua
va cao » va cac, va co, va dao
san ky » sang ky, van ky, dan ky
cua te » cua tu

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

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