Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua viet » ca viet, hoa viet, cua vat
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ty hang » ly hang, ty xang, thi hang
ty tang » tay tang, ty xang, ky tang
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
vi cua » vai cua, di cua

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 ((ty tang) or (ty hang)) mai hoi. hieu ve nam thu ((va danh) or (van thanh)) vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty tang) OR (ty hang)) mai hoi. hieu ve nam thu ((va danh) OR (van thanh)) vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty tang) or (ty hang)) mai hoi. hieu ve nam thu ((va danh) or (van thanh)) vi cua viet*.