Perhaps you should try some spelling variations:
thoi van » thoai van, thi van, thai van
cac thoi » cac toi, cac hop, cac tro
hieu ve » hieu va, hieu van
co sach » bo sach, cuon sach, hoc sach
van anh » van thanh, tuan anh, van minh
su sach » so sach, vu sach
ve cac » va cac, vien cac
dai va » mai va
x hoi » xa hoi, o hoi, x ho
di va » di vao, doi va, di vat

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 (co sach)) ky nang x hoi. hieu ve cac thoi van anh ((di va) OR (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ky nang x hoi. hieu ve cac thoi van anh ((di va) OR (dai va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ky nang x hoi. hieu ve cac thoi van anh ((di va) OR (dai va)) triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ky nang x hoi. hieu ve cac thoi van anh ((di va) OR (dai va)) triet*.