Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
danh sai » dung sai, danh bat, danh dau
danh va » doanh va, hanh va, anh va
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
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 sach y nang o hoi. hieu ve am thuc va ((danh va) or (danh sai)) ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. hieu ve am thuc va ((danh va) OR (danh sai)) ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang o hoi. hieu ve am thuc va ((danh va) or (danh sai)) ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. hieu ve am thuc va ((danh va) or (danh sai)) ((cua triet) OR (cua viet))*.