Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, ban hanh
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
va danh » va dinh, va dan, dia danh
hieu va » lieu va, hieu qua
cao luc » bao luc, cao duc, cao suc
tu ban » thu ban, te ban
vi cua » vai cua, di cua
va cao » va cac, va co, va dao
ban 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 ban ky ((nang xa) or (sang ma)) hoi. hieu va cao luc ((va hanh) or (va danh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky ((nang xa) OR (sang ma)) hoi. hieu va cao luc ((va hanh) OR (va danh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ban ky ((nang xa) or (sang ma)) hoi. hieu va cao luc ((va hanh) or (va danh)) vi cua te*.