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