Perhaps you should try some spelling variations:
doanh dao » doanh bao, doanh cao, doanh giao
danh dao » lanh dao, danh dau, dinh dao
cua viet » hoa viet, cua vat, cua dieu
ca viet » va viet, co viet, hoa viet
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
ve am » va am
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang o hoi. hieu ve am thuc va ((danh dao) or (doanh dao)) ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. hieu ve am thuc va ((danh dao) OR (doanh dao)) ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang o hoi. hieu ve am thuc va ((danh dao) or (doanh dao)) ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. hieu ve am thuc va ((danh dao) or (doanh dao)) ((cua viet) OR (ca viet))*.