Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh dau » lanh dao, hang dau, danh tu
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
danh va » doanh va, hanh va, anh va
y nang » ly nang, v nang, may nang
o hoi » co hoi, o hoc, o hai
ve am » va am

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) OR (ky nang)) o hoi. hieu ve am thuc va ((danh va) or (danh dau)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) o hoi. hieu ve am thuc va ((danh va) OR (danh dau)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ky nang)) o hoi. hieu ve am thuc va ((danh va) or (danh dau)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ky nang)) o hoi. hieu ve am thuc va ((danh va) or (danh dau)) cua triet*.