Perhaps you should try some spelling variations:
nang doc » nang luc
ban hanh » ban hang
van hanh » van thanh, van ban, van minh
su triet » su viet, su tien, ve triet
bach ky » bac ky
doc loi » duc loi
hieu va » lieu va, hieu qua
cao suc » cao su, cao duc
van anh » van thanh, tuan anh, van minh
va cao » va cac, va co, va dao
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ky nang doc loi. hieu va cao suc ((ban hanh) or (((van hanh) or (van anh)))) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang doc loi. hieu va cao suc ((ban hanh) OR (((van hanh) OR (van anh)))) vi su triet.
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang doc loi. hieu va cao suc ((ban hanh) or (((van hanh) or (van anh)))) vi su triet*.