Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
danh vai » danh sai, danh va, doanh van
thang va » trang va, thong va, thanh va
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
su sach » so sach
vu sach » vu bach, vu khach
vai va » mai va, dai va, hai va
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: ((su sach) OR (vu sach)) thi ((thang va) or (hang va)) hoi. hieu ve am thuc va danh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) thi ((thang va) OR (hang va)) hoi. hieu ve am thuc va danh vai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) thi ((thang va) or (hang va)) hoi. hieu ve am thuc va danh vai va triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) thi ((thang va) or (hang va)) hoi. hieu ve am thuc va danh vai va triet*.